Rear gear change

[Jerry@CHP]

Joe,

The 3.73 rear ratio is a good choice. You probably have an M20 which is the better trans to have for your application.

As to setting up rears, I've been doing them now for almost 40 years and I had one yesterday that kicked my as......Had the pinion out four times setting the depth, changed the back lash about six times trying to get a good pattern on the gears. The aftermarket gears are much harder to set up in getting a good pattern. They give you a tolernace on the pinion to check depth but most of the time after you check the pattern when setting the depth, it's not good at the depth that they recommend. You also need a good supply of shims for the pinion, side carrier shims, clutch shims, etc. The aftermarket shim kits are a joke! GM has always been the best for these items but a lot is being discontinued now. As to tools, you'll need a depth gage, inch pound torque wrench, .001" dial indicator, a torque bar attaching to the yoke to help in crushing the crush sleeve and more. After all these years, I still hate doing rears!

Jerry