I was driving my ZJ with 33s on the road and suddenly started hearing metal on metal clunking noise when I would let off the gas. The side gears and spider gears were chewed up on the edges of the gears. TJ - HP44/9" F-150 FX4. VortecJeep, Oct 11, 2008 #3. devlsh1 Active Member. Joined: Jan 10, 2007Yitamotor is a hi-tech enterprise which specializes in the research and development of Auto Parts and Car Accessories, which included LED Light Bars, Off-road Lights, Headlights etc for truck, suv & jeep. Dec 30, 2015 · I have a 2012chevy Silverado 4x4 5.3 flex fuel it just turned over 118,000 miles The engine has ran fine and has never used any oil at all, and the oil has been changed every 5000 miles since its been new. Now just over 118,000 miles its started to knock/ tick and it sounds like its coming from the rocker arms from cylinder 1 and 3.