http://www.crt-performance.com/speedometers.htm

I put in a 26" diam. tire, manual trans., 3.73 rear gears and an eight
tooth drive gear,(new to the 90 T5) came up with a 23 tooth driven gear.
But, they say there that the 23 tooth is weak, and to use the 21 tooth
(red). Hope that helps.

I know this has been raised a thousand times but I am going to go with gears
next summer. I have the stock 2.73s in my 93 GT 5-spd. I was thinking of the
3.73s, but can you actually get any traction with them off the line?
Second, and maybe more importantly, would 3.73s be too high with a blower.
Just the run of the mill entry-level Paxton to get me to 300 horse. I know
those come on higher up in the band, but would the gearing make it just spin
from the line? Maybe then a 3.55 or dare I say a 3.27? (Oh, had 3.08s in a
92 LX 5.0 convertible with a 5-spd. Spun the tires no problem... 2.73s of
course are more sluggish, surprisingly so, but you can get 30mpg on the
highway with them!)

Thanks any and everyone.

Brad