Removing the bushings on top of the rear differential - Pontiac GTO Forum
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post #1 of 21 (permalink) Old 10-28-2013, 05:52 PM Thread Starter
 
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Removing the bushings on top of the rear differential

I have just about given up on removing my old, hard, cracked bushings from my rear diff on my 1970 GTO. I've beaten and banged on them, heated them with a torch (thats how I got my front bushings out), hit them with an air hammer, and so far they haven't budged, but I have managed to mangle them enough that now I HAVE to get them out. Any tricks here?? I'm painting my frame/suspension tomorrow and would like to paint the diff as well but I need those bushings out first!!

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post #2 of 21 (permalink) Old 10-28-2013, 05:58 PM
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Take a 3/8" drill bit and drill all around the center in the rubber to get it out. Works like a charm.
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post #3 of 21 (permalink) Old 10-28-2013, 06:00 PM Thread Starter
 
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Great... of course my friend who needed to borrow my drill for a 'day' has still not given it back. I guess I better remind him tonight...

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post #4 of 21 (permalink) Old 10-29-2013, 10:13 AM
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......and after you drill out the rubber and drive the inner sleeve out, you can easily collapse the outer shell and drive it out. I've never had a problem with them using the right bit on my air hammer: a very thin, wide rounded blade that conforms to the outer shell of the bushing and lets me walk it out from under the lip. Easypeasy, Jaaaap-an-eesy. Any questions?
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post #5 of 21 (permalink) Old 10-29-2013, 10:34 AM Thread Starter
 
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I'm not sure what you mean. Are you talking about the bushings on the control arms or on the rear diff? These are the ones I'm referring to. I don't see anything that could collapse as it all seems to be pretty thick gauge steel.

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post #6 of 21 (permalink) Old 10-29-2013, 01:25 PM
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Yep. Those are the ones. The right air chisel bit and the right technique and its less than a 5 minute job. BTDT many times.
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post #7 of 21 (permalink) Old 10-31-2013, 09:00 PM
 
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Here is another trick that helps... hold a 2lb or larger hammer on the backside of the ear while you smack the bushing. This helps the bushing absorb the impact, and provides a little support to avoid breaking the ear off the diff. I have not had this happen, but have heard of it...
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post #8 of 21 (permalink) Old 11-03-2013, 08:21 PM
 
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Do you have an heat they fall out when you heat them up but if not agree drill out the rubber and collapse the outer case put some anti sieze on the new ones if you ever have to change them out plus the drive in a little easier.
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post #9 of 21 (permalink) Old 11-03-2013, 09:16 PM Thread Starter
 
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I got them out with a drill and an air hammer.

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post #10 of 21 (permalink) Old 11-04-2013, 01:34 PM
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Excellent. The trick is to get underneath that flanged lip, and walk the blade of the air hammer around the circumference while prying out. It takes a super thin but strong blade and it gets easier the more you do. I can't even fathom trying to smack them out with a regular hammer....I'd be afraid of breaking the casting. The 'shock' effect of the air chisel is what does it.
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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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