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Bent axle, axle casing, or frame.

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Old May 27, 2020 | 03:29 PM
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Annihilate's Avatar
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From: Michigan
Car: 1988 IROC-Z/G92
Engine: 5.0
Transmission: T-5
Axle/Gears: BW 3.45 Eaton Truetrac
Bent axle, axle casing, or frame.

Hello everybody,

A few years ago I got into an incident where the rear driver side of my car got a little too touchy with a large curb at speed.

The result was a slightly torqued frame and some bent suspension parts. I replaced the pan hard bar, and the control arms, then I replaced the driver side axle, which was hard enough to track down for my rear end.

Years later, I finally get it to a shop to straighten my frame, and first they say I need an adjustable panhard bar. OK, so I had one sent to the shop.

Now they are telling me the AXLE is bent on the driver side once more. Now this seems unlikely to me, as the replacement was perfectly straight. They put it on the aligner and sent me this result.




So they can't put my SBCs on or get the rear lined up nicely.

My question firstly is:

1. Is it possible that I bent the axle by driving on it with the frame slightly bent?

2. Is it possible that the casing itself is causing the discrepancy, and is it possible for them to straighten this?

3. If all else fails, I feel I should probably just get a new rear end, this is turning into a big headache, and I just want to be able to drive again.

So which rear would y'all suggest as a reasonable upgrade along the lines of my G92 rear? Would a 4th gen rear be the logical step? Or something else.

Please let me know your thoughts, this snag has set me back and I'm itching to be moving forward again.

Thanks for all the help in advance!

Last edited by Annihilate; May 27, 2020 at 03:38 PM.
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Old May 28, 2020 | 05:04 PM
  #2  
drknow90rs_ss@y's Avatar
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From: Wittman,Az
Car: 86 IROC-Z, '71 RS
Engine: 305 TPI/ 350
Transmission: 700R4/TH350
Re: Bent axle, axle casing, or frame.

Originally Posted by Annihilate
Hello everybody,

A few years ago I got into an incident where the rear driver side of my car got a little too touchy with a large curb at speed.

The result was a slightly torqued frame and some bent suspension parts. I replaced the pan hard bar, and the control arms, then I replaced the driver side axle, which was hard enough to track down for my rear end.

Years later, I finally get it to a shop to straighten my frame, and first they say I need an adjustable panhard bar. OK, so I had one sent to the shop.

Now they are telling me the AXLE is bent on the driver side once more. Now this seems unlikely to me, as the replacement was perfectly straight. They put it on the aligner and sent me this result.




So they can't put my SBCs on or get the rear lined up nicely.

My question firstly is:

1. Is it possible that I bent the axle by driving on it with the frame slightly bent?

2. Is it possible that the casing itself is causing the discrepancy, and is it possible for them to straighten this?

3. If all else fails, I feel I should probably just get a new rear end, this is turning into a big headache, and I just want to be able to drive again.

So which rear would y'all suggest as a reasonable upgrade along the lines of my G92 rear? Would a 4th gen rear be the logical step? Or something else.

Please let me know your thoughts, this snag has set me back and I'm itching to be moving forward again.

Thanks for all the help in advance!
I would just go to a wrecking yard and pick up a nice thirdgen axle housing. It doesn't have to be a disc rear, and it doesn't matter weather it comes from a v-6, or not. Just switch the parts from your old housing to the"new" one. Switching to a fourthgen rear can cause all sorts of fitment issues.
If you have the cash to get a new axle, I would get a Strange S-60. Your axle could be straightened, but the price would likely be pretty high. If you decide to go that route, I imagine the body shop knows where you could get that done. Still, I wouldn't have your original axle straightened. It's just too likely they won't be able to get it perfectly straight.
DR.K.

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Old May 28, 2020 | 05:50 PM
  #3  
Annihilate's Avatar
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Joined: Nov 2012
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From: Michigan
Car: 1988 IROC-Z/G92
Engine: 5.0
Transmission: T-5
Axle/Gears: BW 3.45 Eaton Truetrac
Re: Bent axle, axle casing, or frame.

Im in such a peculiar pickle.

So you say any junkyard rear will work? Wont it have to be a 9 bolt still?
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Old May 28, 2020 | 11:19 PM
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84 1LE's Avatar
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From: Oyth
Car: 89RS vert
Engine: Erod
Transmission: 4L65e
Axle/Gears: BW, 3.27
Re: Bent axle, axle casing, or frame.

No, any third gen f-body rear diff will fit/bolt on/P&P. 4th gen will too, but they are 3" wider.
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