About diffs....I swapped mine out for a 3.46 with the 5 speed. It makes a great combination. The automatics though with the 3 speed would be great with the 3.73. The diffs from the e30 series work but the rear diff cover must be replaced with the original replacing the cover from the e30. Otherwise it is a direct bolt-on. Make sure you buy the cover gasket....and have fun.

sweet deal...

a) do you think then that 3.73 is too much? i have a 5 speed as well, with a final drive of 3.25

b) what part of the differential exactly is the cover gasket? (i'm ig'nant)

c) looking in my bentley manual it shows the "speedometer pulse sender" being on the differential... how will this affect what my speedometer reads? will it read how fast i'm really going, or will it read how fast it thinks it's going without accounting for the new final drive ratio?

thanks so much

--ethan
87 535is