Discussion in 'Transmissions' started by Saeulfr, Mar 6, 2019.
Considering what is at stake I've always recommended ONLY the correct GM lubricant for these transmissions. Costs too much to fix the mistake if someone else's "compatible" lube screws it up.
Concerning the master cylinder differences, the master cylinder for the old style external slave has a small hole in the firewall with 2 offset holes that it bolts into. Pretty simple arrangement.
The master for the newer style integrated slave/release bearing is a ridiculous setup where there is a stepped hole in the firewall, meaning you have a couple layers of sheetmetal and there are two different sized holes it goes through, so that a lip on the rear of the master rests against the smaller hole and you clock the master into a square hole in a bracket that bolts onto the interior side of the firewall. It's stupid as hell. I absolutely hated life converting a 1994 model truck to use the new style master cylinder.
Old style (Not the best pic but you can clearly see the offset holes for the mc bolts)
Thanks guys. Ended up just going for a hd rebuild. Will be swapping motors later this year so decided it was worth it to just spend the money seeing as I'm gonna completely rebuild a 454 to go back in it. New one is supposed to handle almost 700ftlb and had a warranty so good deal all around. Thanks for the help and advice though
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