GM Olds 8.5 10 bolt axles bent, both of them. Olds 8.5 the same as Chevy 8.5s? - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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  #16 (permalink)  
Old 04-15-2014, 09:25 PM
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The Moser's will have to be custom, because I also looked on their site and they only have C clips for stock applications. I guess Ill have to call Moser, I like them, I got 35 spline axles in my 9 inch for my truck, but expensive.

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Old 04-16-2014, 05:57 AM
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Moser knows exactly how to make them. I've ordered them before.
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Old 04-17-2014, 02:52 PM
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ya, Ill need to buy some. I just came from machine shop, passenger side bent bad, driver side bent a little.

Also had broken bearing on passenger side.

heres some pictures







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Old 04-17-2014, 04:07 PM
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i worked for dana heavy axle division in the 80s
every axle had to be straightened after heat treating
so they can be straightened and you may have a better axle after straightening them than one yous can find

the spiral lines on both axles are from induction heat treating the axles
set up a couple of v-blocks on the bearing surface and towards the splined end
use a dial indicator to check run out on the flange and a couple places on the shaft
start straightening

here is a video of axles being straightened on a cnc machine after heat treating them
in the 80s we had a semi-manual hydraulic version with 5 dial indicators and the operator rotating the axle by hand

https://www.youtube.com/watch?v=Gq_br5yTFZM

and no one has mentioned the obvious... are the wheels bent?
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  #20 (permalink)  
Old 04-17-2014, 04:09 PM
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Better check the housing too. If the axles got bent the housing might have got bent too.
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Old 04-19-2014, 08:05 AM
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I asked the machine shop about straightening, but he said he couldnt do it. He said it was an art form.

Now, I was 40 off on the passenger side and the drivers side was almost perfect when he checked on the lathe- only 1000 off in a spot.

But both wheels were wobbly the same amount, it was like the wheels wobble mirrored itself. Im thinking more stuff is broken.

It might be smart to just put it back together and save up for a 12 bolt.
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Old 04-19-2014, 08:17 AM
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Don't give up on it. The A body 8.5 is a popular rear end, and kind of hard to find. If you don't want to work with it at least sell it to someone else who would be willing to rebuild it. As long as the housing is good the rest of it can be fixed. Even bent axle tubes can be fixed.
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Old 04-19-2014, 10:07 AM
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Quote:
Originally Posted by big gear head View Post
Don't give up on it. The A body 8.5 is a popular rear end, and kind of hard to find. If you don't want to work with it at least sell it to someone else who would be willing to rebuild it. As long as the housing is good the rest of it can be fixed. Even bent axle tubes can be fixed.
I have to second this opinion, the A-body 8.5" is real hard to find, and the 12-bolt is not much stronger at all. You could rebuild/beef-up what you have and end up with a stronger rear than a stock 12-bolt would be...for probably less money too.
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Old 04-19-2014, 02:56 PM
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any way to tell if the housing is bent without taking it out?
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Old 04-19-2014, 03:02 PM
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Look down the axle tubes from one end, like looking down a shot gun barrel. You should be able to line up all of the circles by looking through it. If the circles don't line up then something is off. You will need to remove the differential to do this.
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Old 05-18-2014, 01:42 PM
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I put the axles back in to see the wobble without the wheels. The driverside has no wobble that I could see. The passenger side was real wobbly.


I decided to get a new axle from Moser. I am going to send them the passenger side axle that is bent. I want to send it to them so they make a perfect match, Im afraid I may not get a measurement correct and the axle will come out wrong.

I also looked down the top of the axle tube and inside as much as I could see. The housing looks straight, from what I could see.

Another question. How do the bearings come off? What is the retaining thing that holds them on called?

thanks
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  #27 (permalink)  
Old 05-18-2014, 02:16 PM
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. The 'bend' is prolly from the axle being twisted... it may not be far from failing... common in drag racing...

. Sounds like you may also have some bent wheels... like 2 or 3 of them...
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Old 05-18-2014, 02:24 PM
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Pressed-on retaining ring that hold the axle bearing onto the axle is called a "wedding band" or "wedding ring", and comes with the new bearing.

Usually takes a press to get them off, or you can cut the wedding band with a cut-off wheel...but don't nick the axle, be careful cutting it. I usually cut it 95% through that is enough to loosen the press fit , then split it the rest of the way with a chisel. Definitely takes a press to put them on.


Plate that holds axle and bearing into the housing is the bearing retainer plate.

Last edited by ericnova72; 05-18-2014 at 02:29 PM.
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Old 05-18-2014, 03:04 PM
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Ok thanks, Im not gonna take them off myself. If moser needs to take them off, then they will have too, or maybe have the machine shop to do it. I dont want to take the bearing / seal off just in case I have to use the axle again.
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  #30 (permalink)  
Old 05-18-2014, 03:16 PM
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Yours look like the original Olds retaining rings which are somehow pressed into a groove in the axle shaft.
The replacement rings are just pressed on after the bearing is on, and are sections of heavy wall tube stock.
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