Rear Diff Question
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Joined: Dec 2011
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From: New Jersey
Rear Diff Question
I have an 80 automatic and someone gave me a rear diff out of an 80/81 4 speed car and i had it rebuilt. I was wondering if the side yokes needed to be replaced? or am i worrying for for nothing.
Last edited by bschuus; Jul 7, 2020 at 03:51 PM.
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You will probably have to change either the side yokes on the rear end or the yokes on the trailing arm assemblies. They are different sized u-joints on the 80-81 automatics and manual transmission cars. The exception to this is the 82 year, they used the manual side yokes even though they were automatics only. The automatics use a 1330 u-joint on the half shafts and the manuals used a 1350 u-joint. Here is the u-joint measurements for each so you can see what is actually installed.
1330 SERIES UNIVERSAL JOINTS ( 1 1/6"cap X 3 5/8"span )
1350 SERIES UNIVERSAL JOINTS (1 3/16"cap X 3 5/8"span)
1330 SERIES UNIVERSAL JOINTS ( 1 1/6"cap X 3 5/8"span )
1350 SERIES UNIVERSAL JOINTS (1 3/16"cap X 3 5/8"span)
Last edited by MattoonVette; Jul 7, 2020 at 06:17 PM.
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