Re: E-Series T5 into AU
Due to the longer box, the crossmember won't fit, as AU don't have dual position like E series. The tailshaft will be too short. The console boot will be wrong. The ECU will be wrong. The bellhousing won't have the structural sump bolts in it. The flywheel and clutch will fit, although being lower spec than AU. You can change the mainshaft only if your box has a tapered roller bearing support in the input shaft. I believe pedal box is the same, although I can't be sure as I normally use a bolt in pedal pin. An AU box should not be hard to come by, they are going to be dearer than an E series, that's all.
If you're not driving a manual you're really just steering.