any insights as to the possibility of getting 75+ mph out of a 1981 300 gd? is it possible to regear these drivetrains? what kind of work and what kind of money would i be lookin at in parts and labor if i had a shop do it? is it a diy type project? would an intercooler help with top speed at all? do they make an overdrive for that model? thanks, everyone. everythings a learning process with me, haha.

Dude, its a 1980's G Wagen..... It wasn't built for highway cruising....

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Over 21 years I owned several:
w108
w110
w111
w115
w116
w123
w124
w126
w212