Will The Timbren Jounce Springs Fit on a Factory Lifted 2021 GMC Sierra 1500 AT4?

Updated 03/13/2023 | Published 03/12/2023

Products Featured in This Question

Timbren Suspension Enhancement System - Rear Axle

(7246)

$267.14

Timbren 1" Spacer For Raised Frame Vehicles - 3/8" Bushing

(147)

$16.57

Timbren 1/2" Spacer for Raised Frame Vehicles

(66)

$11.54

Question:

Does this timbrin kit fit the 2021 at4 gmc 1500 since it has a 2” factory lift? I don’t see a sub model listing?

asked by: Glenn

Expert Reply:

The Timbren Springs # T28MR has an overall height of 5-11/16". With your 2021 GMC AT4 having the factory lift you will want to measure the distance from inside the cup on your current jounce bumper to the pad on the axle. We do have a 1" Spacer # A25723-90AH00 and 1/2" Spacer # TA25722-90P00 which can be added to the jounce spring to give you the recommended 1" of air gap between the jounce spring and axle pad. You will likely need to source a longer M10 - 1.50 bolt locally to account for the added height of the spacers.

expert reply by: Bud M