U Got an Aftermarket T5?

[FoxTail]

Looking at some of the aftermarket T5's. See a lot of them are running .63 ratio 5th gear vs factory .68.

For those of you with the .63 ratio, what kind of rpms are you seeing at 70-75 with 373 rear end?

Any recommendations on 5th ratio choice and manufacturer?

 

[mwood]

Has to be a calculator somewhere for that. If you know the gear ratios for 5th gear and the rear end, that has to be simple math.

PS, almost forgot tire diameter. Should be about 25.7".

 

[90lxcoupe]

with a 26" tire, 70mph will be 2125rpms, at 75mph it will be 2275rpms

with a 28" tire, 70mph will be 1975rpms, at 75mph it will be 2125rpms

 

[mwood]

RPM/MPH From Gear Ratio Calculator by Wallace Racing
Using 25.7, .68, 3.73 2500 is 75.36
25.7, .63, 3.73 2500 is 81.34

 

[FoxTail]

Thanks for the link and quick response. Just what I needed.