| | Used Gear Pattern Opinions Needed
Car is a 99 Z28 T56 that a buddy and I had installed a set of used OEM 4:10 gears last spring. It had stock 3:42's with .0075" lash and a .032" pinion shim, we put new pinion bearings with a solid crush sleeve in with the 4:10's and ended up with .008" lash with a .023" pinion shim. It was quiet everywhere but very slight throttle between 35-50. After multiple passes at the track it slowly started having a slight wine at most all cruising speeds but quiet when coasting or into the throttle. Here's what the current pattern looks like, the backlash opened to about .009". I was thinking about adding .002-.003" to the pinion shim what do you guys think?