brnc_bstr87

I'm trying to do research on an upcoming project of mine. I'm wanting to rebuild my t5 transmission and rear end & need some help with gear choices. I have a 1987 Gt Convertible & I'm wanting something kinda decent on gas but yet can have a little fun with. I'm not wanting to race it just enjoy it :-D. If anyone can give me some input on what tranny gears I should use with what rear end gear it'd be awesome! Hope everyone has a happy thanksgiving! ~Q

AdderMk2

Assuming your T5 is out of a fox, the easiest and cheapest upgrade would be to find a 5.0l SN95 and grab the trans. then simply swap the fox input shaft into it. Anything beyond that, you should just get a TKO or 3550. As for rear end gears, Stick to a set of 3.27s or 3.55's. Plenty of enjoyability, and will still keep you in a decent RPM range for gas savings.

wydopnthrtl

Astro performance makes a T5 with a different 1st and 5th gear ratio. That can make for a steeper rear gear. Just depends on what suits your driving style.

mjr46

3.73's work well for the street and still net me close to 20 mpg in my 89 vert

projectresto83

I have 3.73's in my 93 and can get up to 25mpg on the highway but with the 3.3* first gear it is a little much for my liking on a DD. Stick with 3.27's, 3.31's or 3.55's

Venomantidote95

U have to also factor in the wheel and tire setup into the decision!

Tony71502

I got 23 MPG when I drove from Pittsburgh to Daytona, Florida. I'm running a stock ratio T-5, 3.73's and 17 inch tires with 40mm sidewalls. 2200 RPM at 70 mph.

AdderMk2

Did you really just say that?