Installed a 9in Readylift on my 18 Silverado 4x4. Tires upgraded to Nitto Ridge Graplers 37x11.5x20 on stock 2015 LTZ Wheels. Shop told me they placed 1.5in spacers. Runs smooth. Although, when turning sharp with more acceleration, I hear/feel a scraping sound. I feel it through the gas pedal. If I go slower, nothing. First I thought it was tire rubbing. I used my phone to record the while driving through the wheel well, no rubbing. I've taken it to the shop about 4 times. They can't seem to figure it out. They supposedly will continue figuring it out. I've looked and looked and no noticeable scrapes on the upper control arms, cv axels, etc. Any ideas?