Recommended Suspension Enhancement For A 2005 GMC Yukon XL Denali

Updated 11/29/2024 | Published 11/28/2024

Products Featured in This Question

Timbren Rear Suspension Enhancement System

(6408)

$269.36

SumoSprings Solo Custom Helper Springs - Rear Axle

(2280)

$267.99

Question:

Hi, I am trying to get my 2005 gmc Denali xl 1500 to avoid sagging when I’m towing a car with a trailer. I have factory air shocks in back and aftermarket factory air compressor that does nothing! Doesn’t level car, doesn’t do *** when I put any load. Will these rubber bump stops rubbers you sell, will this resolve my sagging issues? I’m looking on your site and just want to confirm this is what I need. These rubbers you sell, they go where the factory bump stops are correct? The coils I have on car, stay on also? Please advise Thank you

asked by: Arman

Expert Reply:

Hi Arman,

The Timbren Rear Suspension Enhancement System # TGMRYS4 are rated for 6,000lbs so they'll definitely help with the sagging, but being as high capacity as they are they'll likely also affect your unloaded ride quality in a negative way. Going with a lower capacity like the SumoSprings Solo Custom Helper Springs # SSR-204-40 (1,000lb load leveling capacity) would help with the sagging without giving you a harsh unloaded ride quality.

These springs are a simple swap out of the factory bump stops and require no maintenance once installed. I have some on my Silverado and the first thing I noticed once they were installed was how much easier making turns was while unloaded. Typically while making a turn your vehicle will start to lean to one side, which can be exacerbated while hauling a load, but with these installed the side that leans down will engage the spring and help hold you firm.

For the installation you can use a pry bar to pop out the factory spring, you might need to twist and pull on it a bit to break it free from any glue that GM could've used. With it removed you can then push in the new SumoSpring into the cup that held the factory bump stop. If you're having issues getting it in you can jack up the vehicle by the frame and place a 2x4 between the spring and contact pad on the axle and then slowly lower the vehicle back down using the 2x4 to force the spring up into the cup.

expert reply by: Kevin C

Arman

11/29/2024

Kevin!!! Amazing detailed reply, thank you. Few more questions. I will not be towing all the time. Once a month to every other month if that. So you are recommending I get the sumo springs correct? So I don’t loose my comfort while not towing? You mentioned it’s 1000lbs vs 6000 on the initial item I messaged you. To confirm, you are advising the1000lbs sumo sprints is going to be enough for my once in a while towing gig? I have a 5 lug pj dove tail trailer and I normally tow same car for work. An old Range Rover at 4600lbs Thank you!

Kevin C.

11/29/2024

@Arman Yes, I do recommend the SumoSprings # SSR-204-40 over the Timbren # TGMRYS4. These are designed to deal with a downward force on the rear axle, which would be your tongue weight and would include anything you load in the back of the Yukon past the rear axle. You can measure your trailer's fully loaded tongue weight either at a CAT scale or with a tongue weight scale # BTBRV44FR to see where you land, but these 1,000lb springs are likely going to have enough capacity to do the job without affecting your unloaded ride quality.

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