BBX

What changed with the rear suspension on the S4?

There were many changes to the front, I was wondering the rear changed as well.

Vilhuer

Nothing really except lower arm front mounting point in body, rear springs where changed in early eighties and rear rollbar was changed early on, that it. Up to '86 MY front mounting point was welded part of the body and after that cast aluminum bolted with three bolts.

Rear subframe was changed in manual gearbox cars in '80 MY but it was due to gearbox change. Suspension mounting points remained same. Automatic subframe was changed only to add twin exhaust mounting points.

soupcan

The hub carrier was changed also. It has larger mounting boss's for the S4 brakes and the brake dust shield was different.

Vilhuer

Of course, forgot those. Also ABS brakes causes changes to hub carrier.

danglerb

With a 79 is there any practical reason to update the A arms vs just using the S4 brakes with whatever adapter it takes?