I recently had a leveling kit installed on my 2021 Silverado 1500 RST with the 3.0 Duramax Diesel. The place I had it installed told me they could only get a 2" front kit and a 2.25" rear block kit. I just assumed this was ok. They installed yesterday and it looked really good!! It still pitched in the front again which I liked so it will level out when I tow. Drove it home and started to notice a vibration when I accelerated and when I slowed down especially when I was turning. I called the place today and I took it in to have it looked at. I waited about an hour and they came back and told me they took out the rear blocks because it was putting too much strain on the u-joint. I asked if they put a 2" or less on the rear would it still vibrate? They told me I couldn't put any size on the rear without customizing the drive train and u-joint. Am I wrong thinking that if you put a 2" block or less in the rear it would still work? My truck came stock with the rear end riding higher. Now my truck looks wrong with the front end riding an inch higher than the rear. Any suggestions? Not willing to down the money on a suspension lift. And yes I'm not familiar with the mechanics of any vehicle so please if I'm wrong tell me politely.