...........just answer item 2 only............and the answer is the most of FWD
transaxles are merging transmission and differential into one unit and using gear oil
(manual) or ATF (automatic transmission)..............but just for the Volkswagen
group automobiles they rather seperate another chamber for differential oil to
lubricating thier transaxle gears also thier oil are different type from ATF....................
hoping won't confusing on you................bye
yogibear