Re: Rear gear change
Yes, GM gears are the best for your application.
In the world of 12 bolt Chevy, typically, the pinion shim is always a .029 shim and might be the same case with your rear axle. Gear patterns always come out nice with GM gears using the .029 shim and about .008" back lash in the world of 12 bolts.
Most people who have been doing rears for many years usually have a big supply of GM shims and such on hand. I do. But it's a 40 year accumulation.
Get them to shim your posi unit clutches while you have it apart.
Going through my parts yesterday, I found a pair of NOS BE posi carrier spring plates. Still have the parts stickers on them. Is anyone getting aroused yet? I used to have tons of BE rear stuff back in the 1970s as that was what would hold up in drag racing!
Jerry
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