cholericfc

I have a 1990 Mustang GT that has a World Class T5, out of an 89 i think, and it used to be AOD - I converted it.

I installed 3.90 gears in it.

What speedo gear size? Where can I get one?

DO THEY MAKE A 22-TOOTH GEAR????

FORD TOUGH

I am not 100% sure but I don't think you can buy a gear for a 3.90. I know ford would not have one because that they never used that ratio. I don't know if there is someone that make them aftermarket. You may want to ask the manufacturer of the gears wear you could find a speedo gear.

302army187

i use a "black" gear for my 4.10's

Timspony

..they do make a "white" 23 tooth...that will get you close...

cholericfc

I was gonna say I have tires that are larger on than stock on the rear. So, the one for the 4.10's/ 23 tooth should even it out pretty close I'd think?

FORD TOUGH

it should be somewhere in the ballpark then. It would be better than a stock gear.

cholericfc

Is their a way to tell which size gear is inside the tailshaft WITHOUT removing it?

AdderMk2

take the VSS out and shine a flashlight in the hole