found a mess in the pumpkin - Pontiac GTO Forum
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post #1 of 4 (permalink) Old 04-27-2016, 08:55 PM Thread Starter
 
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found a mess in the pumpkin

Seems that somebody welded this pin, the weld popped, the pin broke, and now my gears are flying free. I'm happy this happened while parking in the garage, and not on the freeway.

Is there some way that I can fix or replace this without going all out? I'd like to replace the just the pin, or maybe the gears. Maybe an aftermarket spool? I'm trying to avoid a huge exercise in shimming a new kit.





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Last edited by torpedo51; 04-27-2016 at 09:53 PM. Reason: pictures missing?
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post #2 of 4 (permalink) Old 04-28-2016, 04:58 AM
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Garage
You don't want a spool, it locks the rear axles together, great for straight line acceleration but not cornering and they are downright dangerous in the wet.

I would look for a good used differential if you need it, you may be able to just replace the cross pin and use a new cross pin bolt.
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post #3 of 4 (permalink) Old 04-28-2016, 10:30 AM
 
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Seen this many times. Spider gear gets galled up on the cross shaft, spins the cross shaft, breaks pin bolt, wallows out the machined holes in the carrier. eventually shaft slides out partially, whacks the pinion gear, something has to break.

What gear ratio are you dealing with?

Have several nice shape 8.2 Pontiac carriers, both early and late style.
High ratio: 2.56 & 2.78
mid ratio:2.93,3.08, 3.23
low ratio:3.36-5.57

Am heading back out, will ck in later.
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post #4 of 4 (permalink) Old 05-09-2016, 02:39 PM Thread Starter
 
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Thanks for the replies.

For the benefit of others: I bought a kit for $100 that contains the pin, the retaining screw, and the smaller gears.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions.

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