Im confused as to what gears may be in my car. Its a 98 Cobra with a t45, 285/40/17 on the rear. So cruising at 65mph in 5th gear i am at 2400-2450 rpms. When i put this input into a gear calculator, it tells me I have 4.30's. The car does not pull like it has 4.30s at all, more like 3.55's or 3.73's. Also from a 10mph roll in first gear, i spin all the way through first and a little more than half of second gear. Not sure if i could do that with 3.55's.

 

sounds like they maybe 3.73's

 

sounds like 4.30's because with my TR3650 and 315/35/17's im at 2300 at 65

 

i have 373s in my 96 and in 5th gear i believe im at 65 around 2200 i could let you know next time im out driving but it sounds like you have 410s or 430s to me

 

3.73's IDK....

 

Not sure.. Never had a T45.. All I can tell you is that in my 3650 with 4.30's... there's no point in using first gear for daily driving...

 

4.30's i guess..

 

OP, you ever find out what gears you got?

 

put your car on jackstands and watch the driveshaft spin.. mark it with a piece of tape or chalk and watch it rotate.
just count how many times the mark goes around