10 reviews for Silverado ZR2/Sierra AT4X Summit Kit – Peak Suspension

Carlo Marzocca
Rated 5 out of 5
October 9, 2025
Exactly what I was looking for. Local product from a local company with an excellent reviews and great people. Quality shows through with the kit along with the tech that worked on my truck. Nick was awesome and took great care explaining everything about the procedure. The ride is unchanged from stock. Ride height is perfect and will fit 35's when I decide to change the 34's I have now. He then set up the alignment after the install and they knew exactly what was needed to complete the job. Looks awesome, will be back to finish with changing out the shocks as soon as possible. Thank you!

+1
Jeremy Frontz
Rated 5 out of 5
November 8, 2024
Overall I am extremely happy with the lift/ leveling kit. I had it professionally installed On my 2022 GMC Sierra AT4X (non AEV edition). I wanted to cram the absolute largest tires I could reasonably fit under my truck. I’m really happy I went with BFG KM3 295/70/R18 (34.3” by 11.6”). These are an aggressive mud terrain that are quieter than the tires that came on my truck from factory. I also wanted to stick with the stock 18” black wheels that came from the factory. I ran into an issue when the installation shop called me at the time it was supposed to be ready for pickup, to tell me that it was not drivable because the upper control arm is pushed up against the tire. Knowing this was a good potential issue, I asked that they had spacers available, they informed me that they sold their last set over the weekend. Initially, they wanted to put inch and a half spacers on which I really did not want. This would only compound the issue of rubbing and make the tires stick out a lot further than I prefer. Ultimately we ended up ordering 15mm (.56”) hub-centric spacers. This allowed me to still use the factory studs, along with the ET lug nuts that came with the spacers. This gives the perfect amount of space needed to clear the tires. I also didn’t want to hack up the fender liner carpet so I heated up a flat head screwdriver and made holes in the bottom section that could not be seen, I then attached large zip ties so I could pull back the liner (worked better in the front and no contact at all). The back sides of the front wheel well does make slight contact with the steel body mounts behind the liner. Not much I can do to improve that. The only really negative thing I have to say, is about Peak Suspension and there turn around time from order to arrival. I ordered the kit on Oct 16th (Wednesday) and it didn’t ship out until Monday the 21st. The kit then did not arrive until the following Monday, the 28th. This meant I had to cancel my install and reschedule for November. I did reach out and CS was really great about emailing me back and offered to upgrade shipping to overnight (not an option when you check out) for $66. In hindsight, I would have paid it to get it tome faster. A better look would be the kit shipping out faster from the time I ordered it, and then expedited shipping wouldn’t be needed. https://www.amazon.com/Wheel-Accessories-Parts-Billet-Spacers-Thickness/dp/B0CVSD5J9J/ref=asc_df_B0BCD2V8Z8/?tag=hyprod-20&linkCode=df0&hvadid=692875362841&hvpos=&hvnetw=g&hvrand=1659834930802267320&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9011817&hvtargid=pla-2281435178138&mcid=fa473167c2bd3e7cb1352b19fd2cff75&hvocijid=1659834930802267320-B0BCD2V8Z8-&hvexpln=73&th=1
Kyle Massie
Rated 5 out of 5
October 11, 2024
I figured I’d pay it forward and post my experience. Finally made the leap and installed the 2.25” Peak Leveling Kit for my AEV 23 AT4X. Swapped to Method 305NV 18x9x-12 based on some postings from Big Dog Builds ZR2 configs. Tried to fit Ridge Grappler 35x12.5, but the width wouldn’t clear. Nitto is true to size, and maybe the Toyo would have fit, but “light trimming” would not have been the case. Ended up with the Toyo RT Trail - 285/75/18. It fit, but rubbed pretty severely at the mud flap when starting turns, but cleared in full lock Followed the Wescott Design Fender pull-back video, for the mods (didn’t have their product, just bolted the liner back. I’m not a gifted mechanic, but after about 90 minutes and some trial and error, I’ve got zero rubbing, even with large articulation, and I’m thrilled with the new look. Wish I could have made the 35x12.5 work, but didn’t have the stomach for another failed attempt. This stuff is difficult to figure out, but in my experience, with the -12, you have a shot at the 35x12.5 if it’s smaller than true, but you’re going to work for it. At a zero offset, I’m not sure what would happen…

Zac Solt
Rated 5 out of 5
October 9, 2024
Rides like stock but the extra 2.25" is nice 👍
Andrew
Rated 5 out of 5
July 8, 2024
Love this kit, great quality, rides close to stock and fits 35s with just some minor trimming. Does stiffen the rear suspension some, but to be expected

Travis T.
Rated 5 out of 5
June 26, 2024
Installed the 2.25 kit on my AT4X AEV Sierra 1500. It gives it the stance that it should have had from the factory. Quality components and straight forward installation. Allowed the fitment of 305/70/18 (35") on factory rims. This tire size / wheel combo did require 1/2" spacers / longer wheel studs along with minor wheel well trimming to fit. Looks great, rides great, performs great. Highly recommend.
mason shelton
Rated 5 out of 5
June 12, 2024
I work at a gmc dealer and this is the only kit i will sell for the at4x. it is by far the best quality and my technicians only have great things to say about the install. very happy

Blake V
Rated 5 out of 5
April 29, 2024
Installed the 2.25 kit on my at4x sierra. Rides stock, perfect stance. Can't wait to hit some trails. Clears 35x12.50 with minimal trimming on 8.5" wheels with 0 offset.

Mike Clark
Rated 5 out of 5
March 21, 2024
Installed it this week, looks great!!! Haven't noticed any difference in the ride so far, either. Great job, Peak! Good times ahead.
Billy
Rated 5 out of 5
December 16, 2023
This kit is AMAZING and will not disappoint like other brands . Definitely recommend going with the quality of peak over others