Will any 02a parts (synchros/ engagement teeth) fit in the 020? Or even whole gear sets? I plan on rebuilding mine with a LSD because not much power adders will be added to the ABA other than simple things and tightening up.
Its pretty much a different beast. Gears are different shape, synchros (wouldnt use a worn one) R&P different. Seals (shouldnt reuse) , Bearings, i think there is 1 or 2 that cross over, but again why use a worn bearing.
Swap the trans, that would be peace of mind, with a diff.