Rear axle position

keynsham1

keynsham1

Active Member
I have Magstars on my NADA and I do get the wheel rubbing problem on one side. On inspection, and I assume due to build tolerances, on the nearside, the tyre is roughly 1/4" closer to the lip of the wheelarch than on the offside.

Is it possible to adjust the diff on the diff carrier to move it across by 1/8"? It isn't very much but may just cure my rubbing issue. The panhard rod is adjustable but I suspect again for build tolerance issues. Mybe slot the holes in the diff carrier plate?
 
Hi The usual practice for this problem is to jack the bottom of the 'D' post out. Jack the car up, remove the wheel, then put a jack between the chassis rail and the bottom of the post and just ease it out.

Colin
 
Yes I have done that. In reality it doesn't really work though! At least it didn't for me. The pillar is very springy and so after jacking it out as far as I dared, when the jack was removed it just sprung in again!!20200905_120746.jpg
 
Hi, You need to push it out further than you need and let it relax back to where you want it to be. Be brave!!

Colin
 
keynsham1 said:
The pillar is very springy and so after jacking it out as far as I dared, when the jack was removed it just sprung in again!!
Click to expand...

That is because it is moving within the elastic range. It will always return until you extend it past the yield point into the plastic range. If you do it will remain and not spring back. An option which is far more preferable that changing the alignment of your differential in order to move the wheel inwards would be to rework that section with the guard removed.

Ron.
 
I know all of that. I am an aerospace stress technician by trade! I am not willing to push it that far though for a few reasons. Firstly I would need to take the wing off. That is a task in itself on a NADA as the rear bumper has a side mount that goes through it. Also I cannot see how if I push the post out far enough that the rear wing will ever align with the door again. Lastly I would be very worried about Structural cracking from forcing the pillar that far. Back to the drawing board I think!!
 
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Hi, In that case try moving wheels around, you may find another wheel has a more favourable tolerance in it's machining and will give a better fit.

Colin
 
The LHS diff carrier rubber mount tends to take the worst loads, and on my car it had sagged a lot, where the RHS rubber was in good shape. this had visibly pulled the stay rod out of its natural line. Strikes me that this sort of misalignment of the diff might push one hub outwards and cause your issue. Might be worth checking those bushes?
 
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