Only the transverse mounted 'boxes are Haldex (that's the rear diff), the longitudibnal ones still use mechnaical Torsen system. A quattro box from an A4 quattro (5 or 6speed available) would be a good plan as only mod req'd would be possible minor fiddling with the mounts.
May need to check on compatibilty of gear ratios with existing rear diff but that's not too dificult to check.
Should make a nice car, the 1.8T is a very tunebale engine and very light.
I ADORE the 5-pots but the 1.8T would make a very good sensible choice for a rapid 80! SHorter, lighter and more powerful.... Keep us updated!
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