Fixing what GM wont on my 2020 AT4 HD & Improving the Ride Quality
Lawrence LT Tolman Lawrence LT Tolman
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 Published On Jul 29, 2021

I've owned the AT4 HD Since september 2019, and its racked up about 40,000 miles on it so far, but those miles haven't been without any issues. The back window leaked, the transmission needed to be replaced, and it needed two new injectors. Luckily all those things were handled by the warranty since for the most part, the truck is stock. But there have been some problems with the front suspension that I need to fix, but since I've installed a leveling kit, I'm on my own. No worries though, its time to upgrade!

Bilstein 5100 Shocks for a stock height truck, they had em in stock!
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