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Discussion Starter #1
Replacement of rear axle. I have a 1966 Pontiac GTO that appears to have a bent axle. Thought it was the brakes squeaking but further inspection showed the axle bent. I’ve never change the axle before can somebody explain the process. Thanks
 

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Replacement of rear axle. I have a 1966 Pontiac GTO that appears to have a bent axle. Thought it was the brakes squeaking but further inspection showed the axle bent. I’ve never change the axle before can somebody explain the process. Thanks
Real quick and dirty....assuming it has a BOP rear end in it, that's a bolt in axle. There's a flange floating on the axle between the pressed bearing and the hub. Disassemble the brakes, unbolt the axle flange, then pull the axle out of the housing. You will have to press the old bearing off. Then you can swap the axle flange to the new axle, then press the new bearing on. Then bolt back together.
I'm sure some of the folks that have service manuals handy will post up pics.
 

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Discussion Starter #3
So what you’re saying is the axle will slip out without taking the cover off the rear end. I’ve heard that there is a C clip of some sort that holds the axle to the gear in the rear end... I have an original 323 limited slip Pontiac rear end.
 

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So what you’re saying is the axle will slip out without taking the cover off the rear end. I’ve heard that there is a C clip of some sort that holds the axle to the gear in the rear end... I have an original 323 limited slip Pontiac rear end.
As OMT said, Chevy rears have that design. Buick,Pontiac,Oldsmobile (BOP) use the flanged setup.
 

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Real quick and dirty....assuming it has a BOP rear end in it, that's a bolt in axle. There's a flange floating on the axle between the pressed bearing and the hub. Disassemble the brakes, unbolt the axle flange, then pull the axle out of the housing. You will have to press the old bearing off. Then you can swap the axle flange to the new axle, then press the new bearing on. Then bolt back together.
I'm sure some of the folks that have service manuals handy will post up pics.
Not too difficult as Mine'sa66 has stated. Not sure if you have to pull brakes or not? Seeing you will be installing a new axle, have a shop install a new seal, bearing, collar and gasket, so you won't have to mess with the bearing/collar on the old axle. At the same time, I would pull the other side and replace the seal, bearing, collar, and gasket.

Here is an earlier forum post that may be of help:


Here is a basic exploded view, but the Service Manual for your car should have all the info you need to do the job if you have questions.

 

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you can avoid removing the brakes , the flange on the axle has a hole to allow access to the nuts to remove the axle just rotate the axle until all the nuts are removed and out comes the axle
 

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Discussion Starter #10
Thank you everyone for your responses. I feel more comfortable in tackling this project.
 

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Discussion Starter #11
Thank you everyone for your responses. I feel more comfortable in tackling this project.
Here’s a follow-up question for you guys. It may sound a little easy for you to answer I hope. I have a four post hoist in my shop that I built next to my house. I love the hoist but when trying to jack up the car off the hoist to get to the wheels sometimes is a challenge. What procedure would you suggest that I use to lift up the rear of the car and secure it so I can get the wheels off of it to remove the axles ..

next question is if in fact my axle is bent which I think it is because it runs out a little bit and rubs the brakes on the drum , what in the world do you think happened to cause it to bend... i’m searching my memory over the last year or so and I can’t remember spinning the wheels or doing any burnouts. I noticed the axle running out when I replaced the rear brakes. I double checked my procedure And don’t think it has anything to do with the new brake installation. I noticed it when I put the new drums on and it started rubbing. I’m at a loss to figure out what happened. Any help to solve my mystery would be helpful thank you guys.
 

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sounds like have twin post lift?
maybe when you are setting the "pads" make sure to catch the frame and not the rear suspension arms, that may be your problem?unless you have a massive tires on rear
 

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Here’s a follow-up question for you guys. It may sound a little easy for you to answer I hope. I have a four post hoist in my shop that I built next to my house. I love the hoist but when trying to jack up the car off the hoist to get to the wheels sometimes is a challenge. What procedure would you suggest that I use to lift up the rear of the car and secure it so I can get the wheels off of it to remove the axles ..

next question is if in fact my axle is bent which I think it is because it runs out a little bit and rubs the brakes on the drum , what in the world do you think happened to cause it to bend... i’m searching my memory over the last year or so and I can’t remember spinning the wheels or doing any burnouts. I noticed the axle running out when I replaced the rear brakes. I double checked my procedure And don’t think it has anything to do with the new brake installation. I noticed it when I put the new drums on and it started rubbing. I’m at a loss to figure out what happened. Any help to solve my mystery would be helpful thank you guys.
I'm assuming your 4 post doesn't have swing jacks? I'd try and center the car best as possible and use jack stands on the frame. May not be wide enough though. 4 post lifts are great, but w/o swing jacks, not really as handy as a hoist. I would assume that it has to do with your brakes. It didn't do this before the brake installation? You didn't bend the axle doing the brakes....
New drums or old? If old, did you mark them where they sat on the flange? They need to go back from whence they came. If you didn't mark them, I'd pull that drum off and rotate it one lug hole at a time and see if you don't solve your problem. Just reread your post...new drums....bet you a big old cup o Joe therein lies your problem. Again, you didn't bend the axle changing the brakes. One of your drums is not sitting flat on the flange. Take a wire wheel/pad sand it smooth. May be able to solve it, may need to replace the offending drum.
 

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Discussion Starter #17
Thank you very much that’s a real good idea. I’m gonna play around with rotating the new drum around the wheel and see if it rotates without a wobble. I know when I finish the brakes and put the new drums on it was doing that so I took the new drum off and put the old drum back on the offending side. It seem to fix it for a bit but then it started squeaking again. I suppose if I take the Drums off with the car jacked up and put the car in gear and watch the end of the axle turning I could tell if it’s got a wobble in it. Anyway thanks very much for the suggestion I’m gonna try that when I get around to it.
 

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Thank you very much that’s a real good idea. I’m gonna play around with rotating the new drum around the wheel and see if it rotates without a wobble. I know when I finish the brakes and put the new drums on it was doing that so I took the new drum off and put the old drum back on the offending side. It seem to fix it for a bit but then it started squeaking again. I suppose if I take the Drums off with the car jacked up and put the car in gear and watch the end of the axle turning I could tell if it’s got a wobble in it. Anyway thanks very much for the suggestion I’m gonna try that when I get around to it.
You may be assuming "axle" when in fact it is the "axle tube" that is bent. Axle tubes do get bent and a specialist shop can check for straightness and/or straighten the tube if they are equipped to do so.
 

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Discussion Starter #19
How does an axle tube get bent? Could jack in the car on each end instead of in the middle result in bending a tube?
 

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How does an axle tube get bent? Could jack in the car on each end instead of in the middle result in bending a tube?
Like anything in life, there's a load of ways to skin a cat. It's not a particularly common event. In your case (drum runout causing interference with brake shoes as I understand it) I would not really be looking for a bent axle tube.
 
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