Review on Ring and Pinion Excel 3.73 Ratio 30 Spline Pinion 3 Series 8.5/8.6 in GM 10-Bolt Kit by Emmanuel Nguyen

are very smooth, used old washers, screwed in tight, and old used screws, lock washers are not a good idea, need to be changed , they will not tighten, will not break out a washer, Small screw head, wrong size bearing, wrong size gear screw and washer, otherwise I was fine with the purchase because Eaton made it alongside them. Under $700 for an Eaton True Trac conversion is better to buy there.