Rough Country 3.5" Vertex Lift Kit for 07-18 Chevy/GMC 1500 2WD - 19850 Fits select: 2007-2016 CHEVROLET SILVERADO, 2007-2016 GMC SIERRA

Just installed on a 2026 GMC Sierra AT4. Overall, it looks and works amazing. There were a couple bumps to watch out for, so hopefully this helps some of you down the road… First off, the frame rail hole on the driver's side (where you would insert the flag nut) is only 25mm in width and no matter how much you try, you won't be able to wiggle the flag nut in there. You'll need to open it up to almost 30mmm, which is the size of the passenger side. Maybe previous years didn't have this issue, and it's new for the '26? The passenger side went in with no problem. Invest in a really good step bit, because that steel is REALLY tough to get through. My axle brackets were not labeled, but you can see they're angled slightly inward; just aim them at the frame rail and you'll be fine. If they point away from the truck, you have them flipped. The frame mounts are poorly fabricated, so take caution here. One of mine was so bad, I almost contacted support to have a different one sent. A little ingenuity and I was able to make it work. Pro tips: Get your axle brackets on first (per the instructions) and torque to approx 110 ft lbs. That should be in the instructions btw. I would NOT use an impact wrench on anything, especially the frame mounts; just snug them up nice and tight, but an impact wrench would snap the welded nuts right off the flange. Then, dry fit everything BEFORE you drill. This is where you stop looking at the instructions. Assemble the entire trac bar end-to-end using only the bolts holding things in place, then mark the location of your frame brackets, and then drill. You'll be surprised at how much of an angle you'll need on the frame brackets so the trac bars don't bind. My gripes: the instructions are not the greatest. They could definitely use a refresh and have more specific things detailed out. The frame brackets are junk. Those could use some rework to be more precise (guessing both of mine came from different jigs and one was WAY off). Hope this helps!

they're great work kids are supposed to my hard part is I suggest welding the brackets to the frame instead of trying to fish them brackets inside of it to bolt it up