Timbren Rear Axle Jounce Spring Kit for 2017 GMC Yukon XL to Prevent Sag from Trailer

Question:

I just hooked to my camper with my weight and sway hitch. When loaded I and still about an inch from touching the factory bumpers. Being that the timbren is the same length, I dont see how it will help. Please ask adam r. To respond, he is who I have been writing. Thanks

asked by: Thomas L

Expert Reply:

Even though the OEM jounce bumper and the Timbren spring # TGMRYS4 that replaces it are the same length they are made of different material and are designed to do something different.

The OEM jounce bumper serves as a fail-safe to prevent the axle bottoming out on the frame. That is all it is intended to do.

On the other hand, the Timbren kit # TGMRYS4 will do that too, but its main purpose is progressively resisting compression. The OEM spring does not get stiffer as it compresses, but the Timbren spring does. This allows it to stiffen your rear axle suspension and support the load from a trailer's tongue weight.

expert reply by: Adam R