question

i was wondering what the difference between a 94 z28 and a 94 trans am is, and is the gearing different in them or are they the same ...

Checking to see if the account activated..

The tranny and rear axle ratios are the same, for the equivalent models.

M6:

All M6's are 2.66/1.78/1.30/1.00/0.74/0.50

All M6's come with a 3.42:1 rear axle ratio (GU6)

A4:

All A4's trannies are:

3.06/1.63/1.00/0.70

A4's came with a 2.73:1 rear (GU2) as the base model (Z28, Formula, T/A) and a 3.23:1 rear (GU5) when the "performance rear axle" package was ordered. 1994 was a bit of an oddball for the T/A, since there was a "base" T/A with only the 2.73's available, and an uplevel T/A GT that only came with 3.23's.

You can check your rear axle ratio on the build tag (door or glove box) by looking for the GU# code.