Anyway of adjusting rear subframe alignment?

[Mark300zx]

Mine was within manufacturers spec, but would be desirable to adjust according to the shop, is there anyway of doing this?

 

[Willie]

Mark,

Do you mean the rear subframe for the back axle or the rear mounting points of the front sub frame?

For the front sub frame you can loosen off the mounting bolts move it in the desired direction and bolt it back up again. But TBH you won't get much movement as the bolts have little slop in the holes.
Why do you need this moved?

 

[Mark300zx]

Had 4 wheel alignment done and they said the rear was slightly out, but still within manufacturers spec.

 

[Willie]

More likely the rear bushes.
Not heard of a need to adjust the rear beam, unless it's warped

 

[Mark300zx]

The equipment they stuck it on is very high tech and I doubt if most places would pick up this small variation, are the bushes difficult to do?

 

[Willie]

They are supposed to be a bit of a pain, I'll be doing mine at some point.
I think there is a guide on here somewhere

 

[Mark300zx]

Also how can you tell if they are knackered?

Thanks for the pm btw

 

[Willie]

No bother.
TBH not too sure.
The geometry tests you have had done would point toward this if you were 100% sure you car is straight and true.
As these bushes flex to allow some passive steering i would say its would be difficult to tell when there shot.
Changing them on a higher mileage car would never be a bad thing

 

[Mark300zx]

Thanks the car is straight and there's no evidence of any damage, I think the bushes may be the culprit as the rear is getting vague!

 

[Willie]

Only other thing that might give a different reading is excessive bearing wear

 

[Mark300zx]

Both rear wheels are equally misaligned if that makes sense, so I doubt if it is the bearings.

 

[Willie]

Perhaps try a second opinion before doing anything about it.
But as said changing the rear beams bushes won't harm only help