Timbren Suspension For GMC Sierra 3500HD With Duallies  

The Timbren Rear Suspension Enhancement System #TGMRCK25D you were looking at for your 2013 Chevrolet Silverado 2500HD 4x4 are 5-1/4" tall without the 1" spacer, or 6-1/4" tall with it. You want 1" - 1-1/2" gap between the…

The Timbren Rear Suspension Enhancement system that you referenced #TGMRCK25D, is intended to replace the factory installed bump stops on your truck. These Timbrens are confirmed as a fit for a 2012 Chevy Silverado Pickup 2500 or 3500 and fit both…

You can certainly use a bump stop type helper spring option like the #TGMRCK25D Timbren or an air helper spring system in conjunction with a weight distribution system such as the Equal-i-zer system, but you might not need it. An air helper spring or…

The biggest difference between the two parts is that the Timbren Rear Suspension Enhancement System #TGMRCK25D is a double-convoluted spring while the Timbren Rear Suspension Enhancement System #TGMRTT35D are single-convoluted springs. The…

Timbren helper springs #TGMRCK25D and #TGMRTT35D have different designs. The springs for kit #TGMRCK25D are double-convoluted. For optimal balance between softness and toughness, fabricators choose the double-convoluted rubber spring. Taller than the…

Timbren rear-axle jounce spring kit #TGMRTT35D is intended for severe service vehicles such as tow trucks so for your towing/cargo application you will use kit #TGMRCK25D. This no-drill install is suitable for heavy-duty trucks like your 2500 whether…

The entire Timbren kit is different between the two trucks that you have so you would not be able to fit swap any portion of what you have to the new truck. You'd need a new kit like the part #TGMRTT35D.

Yes the SumoSprings part #SSR-207-47 are a fit for your 2021 GMC Sierra 2500HD 4WD and will do a great job eliminating the sag you have at the rear of the truck when towing.

If you are going to be hauling a conventional trailer or something in your truck bed I suggest the SumoSprings Solo Custom Helper Springs - Rear Axle #SSR-207-47. They are maintenance-free - no tubing to run or air pressure to monitor like with air…

When at 50 percent compression the Super Springs part #SSR-207-47 can provide 1,500 lbs of additional capacity. This will give you additional suspension support and will also allow for a smoother ride quality unloaded than the Timbren. You should…

For your 2015 Chevy Silverado 2500HD towing a 12,000 lb fifth wheel trailer I recommend the SumoSprings Solo Custom Helper Springs #SSR-207-47, because Timbrens will make your ride a bit rougher than the SumoSprings. The SumoSprings work by…

For your 2022 Chevrolet Silverado 2500 SumoSprings Solo Custom Helper Springs #SSR-207-47. These springs have a 1,500 lbs capacity and help minimize sway and absorb bumps and shocks. The durable composition these springs are made up of resist damage…