Hey man nice car I too have a 90GT as far as gearing you will feel a bit more punch in 3rd-5th, but it does strain a bit on highway speeds. MY GT with 4:10's has the punch, but I would stay with the 3:73's especially for a driver. The benefit on gettyup is minimal in comparison to 2:73's plus you gotta have a quick hand cause 1-2 shift hits almost instantly if your motor revs fast and hard. If I had it to do over 3:73's would be in mine! I run 3:55's in my 92 LX and actually prefer them over the 4:10's for average use stilll plenty of pep and getttyup but doesnt scream at 80plus on highway. Hope that is a little help. It's all preference tho to me traction gets more difficult the lower ratio you go without slicks. Killer looking paint sceme I was planning on EXACT setup guess I gotta go back to the drawing board..LOL Later ADAM