Originally posted by donuts2001
How much difference is there between the lower suspension of the AU and EA?.....
Fabricated pressed steel K-member which supports engine, steering rack and forged steel lower arm and associated strut-rod? (maybe wrong name). Suspension upright contains upper & lower ball-joints with pin captured in pressed steel upper A-arm. Inner bushes for upper arms located on body-mounts. Mounts located by 4 holes.
AU (and as far as I know BA)
Cast alloy cross member supports engine, steering rack and rear leg of forged lower arm which is now of an A or L type shape. Forward leg of lower arm is supported forward of this crossmember. Suspension upright is similar in concept though upper balljoint is now carried by forged upper A-arm with pin captured in upright. Upper arm contain inner bushes. Mounts to body by same 4 holes.
Front spring/strut the same. Sway bar differences in both location and mountings though easily swapped over.
The frame rails as far as I can tell are the same shape but the location of positioning dowels and securing bolts differ slightly. These are just tack welded into predrilled holes. It would not be difficult to duplicate AU mounts on E-series rails.
The cast alloy sump and crossmember where major alteration introduced with AU to address stiffness and vibration. The removal of the K-member and replacement with a single crossmember aids head-on crash survivability (car crumples more easily).
Just to prove that K-member and alloy crossmembers can be swapped have a look at this AU rally ute of Scott Hart. It has had the reverse swap done. It carries an EB K-member & suspension with modified (legthened) EB uprights.