Oldsmobile part #7 - Converting the 10 bolt rear end to Posi with new gears - Part 1

Starting the rebuild of the Oldsmobile 8.5 inch rear end. This video includes the full teardown of the rear end to prepare for the new gears and Posi unit.

[@duncanmacrae6384]

Sounds like you're on the right track. We can't all start with a pristene W30 convertable.

[@lesliemclean4381]

Damnskippy!So far so good!

[@neilstanich7870]

unless I forgot how to count thats a 12 bolt rear

[@borgtriestofixit]

There are 12 bolts on the back cover, but only 10 bolts holding the ring gear to the carrier, so most people consider it a 10 bolt...Oldsmobile just being different

[@Chris-ly9st]

these videos are awesome. I have the exact rear end in my 68 cutlass and I want to upgrade to a posi as well. what was the brand and model of the posi unit you installed?

[@borgtriestofixit]

I used this kit for the Posi Unit and gears - www.ronsmachiningservice.net/gear-posi-packages/general-motors/gm-olds-o-axle/gm-8-5-olds-o-axle-3-42-ring-pinion-28-spline-posi-gear-pkg/

[@borgtriestofixit]

Sorry, just saw that website no longer sells the kit i used...it was a yukon Posi unit for the 28 spline rear end and 3.42 richmond gears