1999 GMC Sierra Suspension Enhancement

Features:

3,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.

Installation Notes:

No drilling required for installation

Does not fit vehicles with factory top overload springs

Features:

3,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.

Installation Notes:

No drilling required for installation

Does not fit vehicles with factory top overload springs

Features:

3,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.

Installation Notes:

No drilling required for installation

Features:

3,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.

Installation Notes:

No drilling required for installation

Features:

8,600-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

8,600-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Tech Tip:

Suspension kit will only fit 3-Door Extended Cab and Regular Cab on 4WD models.

Features:

6,000-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Tech Tip:

Suspension kit will only fit 4-Door Extended Cab and Crew Cab on 4WD models.

Features:

6,000-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

6,000-lb Capacity. These hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Tech Tip:

Suspension kit will only fit 4-Door Extended Cab and Crew Cab on 4WD models.

Features:

Get improved handling with minimal sway and body roll for your vehicle with this suspension enhancement kit. Stainless steel StableLoad pads feature quick-disconnects and a hinged design so you can easily return to your original ride when not towing.

Installation Notes:

No drilling required for installation

Product designed for vehicles with factory leaf springs and a lower overload spring

Features:

Get improved handling with minimal sway and body roll for your vehicle with this suspension enhancement kit. Stainless steel StableLoad pads feature quick-disconnects and a hinged design so you can easily return to your original ride when not towing.

Installation Notes:

No drilling required for installation

Product designed for vehicles with factory leaf springs and a lower overload spring

Features:

2,800-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Features:

2,800-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Features:

3,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.

Installation Notes:

No drilling required for installation

Product is intended for vehicles with factory top overload springs

Features:

3,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.

Installation Notes:

No drilling required for installation

Product is intended for vehicles with factory top overload springs

Features:

7,000-lb Capacity hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Provides a comfortable ride by absorbing road shock and improving stability. Ideal for trucks with slide-in campers or an in-bed salt spreader.

Installation Notes:

No drilling required for installation

This is a Severe Service kit and should only be used on vehicles with a slide-in camper, salt spreader, or those with a mounted crane or other aerial device, such as on a tow truck.

Compatible with in-bed hitch

Features:

7,000-lb Capacity hollow rubber springs sit above the rear axle to help stabilize and level your vehicle. Provides a comfortable ride by absorbing road shock and improving stability. Ideal for trucks with slide-in campers or an in-bed salt spreader.

Installation Notes:

No drilling required for installation

This is a Severe Service kit and should only be used on vehicles with a slide-in camper, salt spreader, or those with a mounted crane or other aerial device, such as on a tow truck.

Compatible with in-bed hitch

Tech Tip:

Suspension kit will only fit 3-Door Extended Cab and Regular Cab on 4WD models.

Features:

5,000-lb Capacity. Designed to upgrade your rear suspension, LoadLifter 5000 air springs provide high-quality, full-time load support. They level your vehicle, improving braking and ride comfort and reducing the strain on your factory suspension.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

2,500-lb Load leveling capacity. Custom helper springs install above your vehicle's rear factory leaf springs to reduce sway and prevent sagging when towing or hauling heavy loads. Silent Ride urethane bushings prevent rattling.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

2,500-lb Load leveling capacity. Custom helper springs install above your vehicle's rear factory leaf springs to reduce sway and prevent sagging when towing or hauling heavy loads. Silent Ride urethane bushings prevent rattling.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

2,000-lb Capacity. Level your vehicle when you're hauling a heavy load with these Ride Control air springs. The adjustable springs improve overall stability and ride quality, eliminate rear sag, and reduce strain on your factory suspension.

Installation Notes:

Drilling required for installation

Not compatible with in-bed hitch; product mounts in same location as hitch brackets

Tech Tip:

Distance from the outside of the frame to the inside of the tire must be at least 6"

Features:

2,000-lb Capacity. Level your vehicle when you're hauling a heavy load with these Ride Control air springs. The adjustable springs improve overall stability and ride quality, eliminate rear sag, and reduce strain on your factory suspension.

Installation Notes:

Drilling required for installation

Not compatible with in-bed hitch; product mounts in same location as hitch brackets

Tech Tip:

Distance from the outside of the frame to the inside of the tire must be at least 6"

Features:

5,000-lb Capacity. LoadLifter 5000 Ultimate air springs have internal bumpers, so you get the adjustable load support of air springs and the comfort and reliability of jounce springs. Jounces also work as a fail-safe if air springs lose pressure.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

5,000-lb Capacity. LoadLifter 5000 Ultimate air springs have internal bumpers, so you get the adjustable load support of air springs and the comfort and reliability of jounce springs. Jounces also work as a fail-safe if air springs lose pressure.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

2,000-lb Capacity. Lowered trucks have a weakened load capacity and reduced suspension travel. SlamAir adjustable air springs beef up your suspension, improving ride comfort, preventing bottoming out, and increasing overall safety.

Installation Notes:

Designed for vehicles that have been lowered 4" to 6"

Not compatible with in-bed hitch; product mounts in same location as hitch brackets

Features:

2,000-lb Capacity. Lowered trucks have a weakened load capacity and reduced suspension travel. SlamAir adjustable air springs beef up your suspension, improving ride comfort, preventing bottoming out, and increasing overall safety.

Installation Notes:

Designed for vehicles that have been lowered 4" to 6"

Not compatible with in-bed hitch; product mounts in same location as hitch brackets

Features:

3,700-lb Capacity. Upgrade your vehicle's front suspension with SuperCoils. They replace your factory coil springs to improve your suspension and reduce sag. Great for snowplows and trucks with beefy bumpers. Maintains stock ride height.

Installation Notes:

No drilling required for installation

Product does not add any lift to suspension; it will remain at the stock height

Features:

14,000-lb Capacity. Great for trucks with plows, these front hollow rubber springs help to stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.

Installation Notes:

No drilling required for installation

Application includes Denali models

Features:

5,000-lb Capacity. LoadLifter 5000 Ultimate air springs have internal bumpers, so you get the adjustable load support of air springs and the comfort and reliability of jounce springs. Jounces also work as a fail-safe if air springs lose pressure.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

2,000-lb Capacity. Upgrade your vehicle's front suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Features:

2,000-lb Capacity. Upgrade your vehicle's front suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Features:

2,000-lb Capacity. Upgrade your vehicle's front suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Features:

2,000-lb Capacity. Upgrade your vehicle's front suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Features:

14,000-lb Capacity. Great for trucks with plows, these front hollow rubber springs help to stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.

Installation Notes:

No drilling required for installation

Features:

14,000-lb Capacity. Great for trucks with plows, these front hollow rubber springs help to stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.

Installation Notes:

No drilling required for installation

Features:

14,000-lb Capacity. Great for trucks with plows, these front hollow rubber springs help to stabilize and level your vehicle. They also provide a more comfortable ride by absorbing road shock and improving roll stability. Easy to install and use.

Installation Notes:

No drilling required for installation

Features:

1,650-lb Capacity. Upgrade your vehicle's rear leaf spring suspension with these helper springs. They reduce sway and prevent sagging, which is perfect for towing or hauling heavy loads. Designed for factory springs that sit above the axle.

Installation Notes:

No drilling required for installation

Product does not fit vehicles with factory top overload springs

Features:

1,650-lb Capacity. Upgrade your vehicle's rear leaf spring suspension with these helper springs. They reduce sway and prevent sagging, which is perfect for towing or hauling heavy loads. Designed for factory springs that sit above the axle.

Installation Notes:

No drilling required for installation

Product does not fit vehicles with factory top overload springs

Features:

1,500-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Features:

1,500-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Features:

Get improved handling with minimal sway and body roll for your vehicle with this suspension enhancement kit. StableLoad pads feature quick-disconnects and a hinged design so you can easily return to your original ride when not hauling or towing.

Installation Notes:

No drilling required for installation

Product designed for vehicles with factory leaf springs and a lower overload spring

Features:

Get improved handling with minimal sway and body roll for your vehicle with this suspension enhancement kit. StableLoad pads feature quick-disconnects and a hinged design so you can easily return to your original ride when not hauling or towing.

Installation Notes:

No drilling required for installation

Product designed for vehicles with factory leaf springs and a lower overload spring

Features:

2,800-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

2,800-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

1,400-lb Capacity. Upgrade your vehicle's front suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Features:

1,500-lb Capacity. Install these helper leaf springs above your vehicle's rear factory leaf springs. They reduce sway and prevent sagging, which is perfect for towing or hauling heavy loads. Designed for OEM springs that sit above the axle.

Installation Notes:

No drilling required for installation

The mounting kit provides U-bolts with 4 inch leg length. If your existing factory springs have had extra leaves added, or for older Chevrolet 3/4-ton and 1-ton models with thicker factory springs, longer U-bolts may be required (not included).

Features:

1,500-lb Capacity. Install these helper leaf springs above your vehicle's rear factory leaf springs. They reduce sway and prevent sagging, which is perfect for towing or hauling heavy loads. Designed for OEM springs that sit above the axle.

Installation Notes:

No drilling required for installation

The mounting kit provides U-bolts with 4 inch leg length. If your existing factory springs have had extra leaves added, or for older Chevrolet 3/4-ton and 1-ton models with thicker factory springs, longer U-bolts may be required (not included).

Features:

5,000-lb Capacity. Designed to upgrade your rear suspension, LoadLifter 5000 air springs provide high-quality, full-time load support. They level your vehicle, improving braking and ride comfort and reducing the strain on your factory suspension.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

5,000-lb Capacity. Designed to upgrade your rear suspension, LoadLifter 5000 air springs provide high-quality, full-time load support. They level your vehicle, improving braking and ride comfort and reducing the strain on your factory suspension.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

1,500-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

1,500-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

950-lb Capacity. Install these helper leaf springs above your vehicle's rear factory leaf springs. They reduce sway and prevent sagging, which is perfect for towing or hauling heavy loads. Designed for OEM springs that sit above the axle.

Installation Notes:

No drilling required for installation

The mounting kit provides U-bolts with 4 inch leg length. If your existing factory springs have had extra leaves added, or for older Chevrolet 3/4-ton and 1-ton models with thicker factory springs, longer U-bolts may be required (not included).

Features:

950-lb Capacity. Install these helper leaf springs above your vehicle's rear factory leaf springs. They reduce sway and prevent sagging, which is perfect for towing or hauling heavy loads. Designed for OEM springs that sit above the axle.

Installation Notes:

No drilling required for installation

The mounting kit provides U-bolts with 4 inch leg length. If your existing factory springs have had extra leaves added, or for older Chevrolet 3/4-ton and 1-ton models with thicker factory springs, longer U-bolts may be required (not included).

Features:

2,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.

Installation Notes:

No drilling required for installation

Features:

2,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.

Installation Notes:

No drilling required for installation

Features:

2,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.

Installation Notes:

No drilling required for installation

Tech Tip:

For vehicles that have an overload spring above the leaf spring pack, or that carry extra heavy loads, see part number RAS3611-HD.

Features:

2,000-lb Capacity. Convert your vehicle's leaf springs into a mechanically active suspension system. RAS adjusts to your load to level your ride. The system also increases stability, handling, and control by improving traction and reducing sway.

Installation Notes:

No drilling required for installation

Tech Tip:

For vehicles that have an overload spring above the leaf spring pack, or that carry extra heavy loads, see part number RAS3611-HD.

Features:

3,000-lb Capacity. Upgrade your vehicle's rear leaf spring suspension with these helper springs. They reduce sway and prevent sagging, which is perfect for towing or hauling heavy loads. Designed for factory springs that sit above the axle.

Installation Notes:

No drilling required for installation

Product does not fit vehicles with factory top overload springs

Features:

3,000-lb Capacity. Upgrade your vehicle's rear leaf spring suspension with these helper springs. They reduce sway and prevent sagging, which is perfect for towing or hauling heavy loads. Designed for factory springs that sit above the axle.

Installation Notes:

No drilling required for installation

Product does not fit vehicles with factory top overload springs

Features:

2,000-lb Capacity. Lowered trucks have a weakened load capacity and reduced suspension travel. SlamAir adjustable air springs beef up your suspension, improving ride comfort, preventing bottoming out, and increasing overall safety.

Installation Notes:

Designed for vehicles that have been lowered 2" to 4"

Not compatible with in-bed hitch; product mounts in same location as hitch brackets

Features:

1,000-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

1,000-lb Capacity. Upgrade your vehicle's rear suspension with these maintenance-free helper springs. Sturdy microcellular urethane springs cushion bumps and help support a heavy load to level your ride and minimize sway. No-drill installation.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

3,500-lb Capacity. Custom helper springs install above your vehicle's rear factory leaf springs to prevent sagging when towing or hauling heavy loads. These heavy-duty springs are engineered for constant use. Includes bolt-on installation kit.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Product is designed for vehicles with approximately 2-1/2 inch wide springs

Tech Tip:

Product is only for vehicles with a base leaf spring that is 43 inches or longer.

Features:

3,500-lb Capacity. Custom helper springs install above your vehicle's rear factory leaf springs to prevent sagging when towing or hauling heavy loads. These heavy-duty springs are engineered for constant use. Includes bolt-on installation kit.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Product is designed for vehicles with approximately 2-1/2 inch wide springs

Tech Tip:

Product is only for vehicles with a base leaf spring that is 43 inches or longer.

Features:

2,500-lb Load leveling capacity. Custom helper springs install above your vehicle's rear factory leaf springs to reduce sway and prevent sagging when towing or hauling heavy loads. Silent Ride urethane bushings prevent rattling.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Tech Tip:

Product is only for vehicles with a base leaf spring that is 43 inches or longer.

Features:

2,500-lb Load leveling capacity. Custom helper springs install above your vehicle's rear factory leaf springs to reduce sway and prevent sagging when towing or hauling heavy loads. Silent Ride urethane bushings prevent rattling.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Tech Tip:

Product is only for vehicles with a base leaf spring that is 43 inches or longer.

Features:

3,500-lb Load leveling capacity. Custom helper springs install above your vehicle's rear factory leaf springs to prevent sagging when towing or hauling heavy loads. Includes bolt-on installation kit.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Product is designed for vehicles with approximately 2-1/2 inch wide springs

Features:

2,000-lb Load leveling capacity. Custom helper springs install above your vehicle's rear factory leaf springs to reduce sway and prevent sagging when towing or hauling light loads. Adjustable springs increase stability. Easy bolt-on design.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

2,000-lb Load leveling capacity. Custom helper springs install above your vehicle's rear factory leaf springs to reduce sway and prevent sagging when towing or hauling light loads. Adjustable springs increase stability. Easy bolt-on design.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Features:

2,500-lb Load leveling capacity. Custom helper springs install above your vehicle's rear factory leaf springs to reduce sway and prevent sagging when towing or hauling heavy loads. Includes bolt-on installation kit.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Product is designed for vehicles with approximately 2-1/2 inch wide springs

Features:

3,500-lb Capacity. Custom helper springs install above your vehicle's rear factory leaf springs to prevent sagging when towing or hauling heavy loads. These heavy-duty springs are engineered for constant use. Includes bolt-on installation kit.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Product is designed for vehicles with approximately 2-1/2 inch wide springs

Features:

2,500-lb Load leveling capacity. Custom helper springs install above your vehicle's rear factory leaf springs to reduce sway and prevent sagging when towing or hauling heavy loads. Includes bolt-on installation kit.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Product is designed for vehicles with approximately 2-1/2 inch wide springs

Tech Tip:

Product is only for vehicles with a base leaf spring that is 43 inches or longer.

Features:

2,500-lb Load leveling capacity. Custom helper springs install above your vehicle's rear factory leaf springs to reduce sway and prevent sagging when towing or hauling heavy loads. Includes bolt-on installation kit.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Product is designed for vehicles with approximately 2-1/2 inch wide springs

Tech Tip:

Product is only for vehicles with a base leaf spring that is 43 inches or longer.

Features:

2,500-lb Load leveling capacity. Custom helper springs install above your vehicle's rear factory leaf springs to reduce sway and prevent sagging when towing or hauling heavy loads. Includes bolt-on installation kit.

Installation Notes:

No drilling required for installation

Compatible with in-bed hitch

Product is designed for vehicles with approximately 2-1/2 inch wide springs

Features:

1,650-lb Capacity. Upgrade your vehicle's rear leaf spring suspension with these helper springs. They reduce sway and prevent sagging, which is perfect for towing or hauling heavy loads. Designed for factory springs that sit above the axle.

Installation Notes:

No drilling required for installation

Product does not fit vehicles with factory top overload springs

Features:

1,650-lb Capacity. Upgrade your vehicle's rear leaf spring suspension with these helper springs. They reduce sway and prevent sagging, which is perfect for towing or hauling heavy loads. Designed for factory springs that sit above the axle.

Installation Notes:

No drilling required for installation

Product does not fit vehicles with factory top overload springs