[m60e30]

ok guys, need to get some imput here, something just isnt adding up.

ok, got me a 5 speed gear box in my e30 ratios are
1- 4.20
2- 2.49
3- 1.67
4- 1.24
5- 1.00

those are pretty low gears, but im using a 2.93 diff, (or i thought i was anyway), but this thing revs like nobodies business.
so i guess my question is, does anyone know how to calculate what my revs should be using this combo?? cuz i thought i would have revs to spare.. the only thing i could see being the problem is its not a 2.93 diff?

the trans is out of a e34 530i, and apparently they used a 3.07 diff in the manual cars...so my taller diff should not be rev city. i can just throw it in second gear for all take offs and its like the perfect first gear.

anyone? anyone?
oh my wheels are 22.5 inch diameter