pieces of metal from axle - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

 
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post #1 of 14 (permalink) Old Jul 24th, 19, 7:53 AM Thread Starter
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Jay
 
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pieces of metal from axle

Had some squealing in the left rear wheel. Took off the drum and pieces of metal fell out (see pic). Took some video of the squealing, which continues, not surprisingly. https://youtu.be/M0rqR_ow0Jw Assuming this is a broken bearing?

It’s a Pontiac rear, 9779822. Thanks!
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post #2 of 14 (permalink) Old Jul 24th, 19, 9:24 AM
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Re: pieces of metal from axle

Yeah, that looks like parts of the bearing.


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post #3 of 14 (permalink) Old Jul 24th, 19, 11:09 AM
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Re: pieces of metal from axle

Quote:
Originally Posted by big gear head View Post
Yeah, that looks like parts of the bearing.

Agreed.

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post #4 of 14 (permalink) Old Jul 24th, 19, 12:32 PM Thread Starter
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Re: pieces of metal from axle

Thanks, guys. I'll be researching how to change the bearing. If the right side is fine, any reason I should change that? The car has 2.56 gears. Is it a significant amount of additional work to change them since I believe I need to take the cover off the differential?
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post #5 of 14 (permalink) Old Jul 24th, 19, 9:48 PM
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Re: pieces of metal from axle

If it's a Pontiac rear end then you don't need to remove the cover to change the axle bearing. The axle is held in with 4 bolts that also hold the brake backing plate on. Remove the nuts and pull the axle out. It may be stuck, so sometimes a slide hammer is needed.

Yes, changing the gears is a significant amount of additional work.


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post #6 of 14 (permalink) Old Jul 25th, 19, 1:17 PM Thread Starter
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Re: pieces of metal from axle

Quote:
Originally Posted by big gear head View Post
If it's a Pontiac rear end then you don't need to remove the cover to change the axle bearing. The axle is held in with 4 bolts that also hold the brake backing plate on. Remove the nuts and pull the axle out. It may be stuck, so sometimes a slide hammer is needed.

Yes, changing the gears is a significant amount of additional work.
Good deal, thanks. I think I'd prefer to not have to remove the cover. Not crazy about it if I have to dismantle the brakes, but that's at least a sit down job instead of a lay down job. That's good info, though. I am hoping to rent the slide hammer tool from a local parts store.
Last question. How do I determine what size it is? 8.2, 8.5. I know little about axles and rear ends right now. I'll be learning as I go through this repair.
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post #7 of 14 (permalink) Old Jul 25th, 19, 2:27 PM
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Re: pieces of metal from axle

8.5 has square lugs that stick down like corners on the center housing casting. 8.2 doesn't.

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post #8 of 14 (permalink) Old Jul 25th, 19, 3:37 PM
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Re: pieces of metal from axle

Pontiac used their own version of the BOP 8.2 rear end in the A body from '64 to '72. If this is an original rear end from those years then you have the 8.2 Pontiac rear end.


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post #9 of 14 (permalink) Old Jul 25th, 19, 4:42 PM Thread Starter
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Re: pieces of metal from axle

Quote:
Originally Posted by dyno jonn View Post
8.5 has square lugs that stick down like corners on the center housing casting. 8.2 doesn't.
Googling for pics. Having a hard time visualizing this, but I suspect it's the 8.2...

Quote:
Originally Posted by big gear head View Post
Pontiac used their own version of the BOP 8.2 rear end in the A body from '64 to '72. If this is an original rear end from those years then you have the 8.2 Pontiac rear end.
...because the casting number 9779822 comes up as the years above. I attached a pic, if that identifies it. I am skeptical i'll be able to determine what parts to buy even when I disassemble it. Hoping it only needs a bearing
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post #10 of 14 (permalink) Old Jul 25th, 19, 4:52 PM Thread Starter
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Re: pieces of metal from axle

looks like an 8.2
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post #11 of 14 (permalink) Old Jul 25th, 19, 5:07 PM
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Re: pieces of metal from axle

That is the BOP 8.2.


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post #12 of 14 (permalink) Old Jul 25th, 19, 5:20 PM
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Re: pieces of metal from axle

Jay, with bearing pieces coming out of it, don't be surprised if the axle surface is trashed. If there's significant wear marks on it, you'll need a new axle.

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post #13 of 14 (permalink) Old Jul 25th, 19, 10:03 PM Thread Starter
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Re: pieces of metal from axle

This was way better than having to take the cover off. Took 5 minutes to get it out. I don't feel any scoring, despite the color difference. Thank you for the confirmation on it being an 8.2.
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post #14 of 14 (permalink) Old Jul 26th, 19, 12:25 AM
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Re: pieces of metal from axle

WELL, in the mid-70s (73-76) there were also some GM corporate 12bolt rears that were TOTALLY different (and larger) from the 65-72 Chevy 12bolt rears. They were often installed in wagons (such as 76 Cutlass wagons) and some El Caminos. They also had the 10bolt covers with 2 big notches (which is misleading to most folks). Unfortunately, these 12bolt rears only came with "hiway" gears (3.08, 2.73, 2.56, etc). And 11in drums. They had larger, 32spline axles. In 77, the same 12bolt GM corporate rear was used, BUUUUUUUUUUT, the axles went to a 28spline-----------the rest of the axle was the same diameter as the 73-76 32spline axles. Maybe Freddie (Big Gear Head) can expand on this a little more.
Posi in these rears was RARE, RARE, RARE!













Here is a typical Chevy 12bolt NON-posi unit (left) and the later GM corporate 12bolt posi. Both are Eaton 2-series. As can be seen, the GM corporate unit is larger than the 65-72 Chevy 12bolt. It also used larger 7/16 LEFT hand thread bolts.







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