OneStopRestoration's Special Orange 69 Chevelle 300 Deluxe Coupe

[OneStopRestoration]

My dad had a set of 4:56 GM gears that came from a very early 67 chevelle ss he had. Thats a story for a different day. Got a used 4 series carrier. I spent several days on this. I cleaned and checked the clutch packs which included shimming per the GM overhaul book.

For setup up of the gear pattern i use a case spreader as to not pound on the shims. This especially gets helpfull when setting up a new set of gears to a housing. After 2 days of in and out with both the pinion shims and the diff shims I got to something I was happy with. The process even with the spreader is very tiring. Shocked on this setup as the pinion shim ended up being the stock .025 which is much thinner than most others i have heard about and done. Most cases as i have seen the stock shim with the housing will work on the next setup even in gears are changed(well for GM for sure)

Once everyting is setup you take all apart put in fresh roller tapper bearings on the pinion, do the torque procedure of the crush sleeve to get the proper drag and then slam in the diff.

I was glad once it was under the car. That only took 30 mins compared to about 3 days.