yamaha537

does anyone know what the stock gears are in a 1989 mustang gt. its a 5.0 5spd if that helps any. im looking to get 3.73 just wanted to know whats in there now. thanks

camaroeater

The gears are different year to year. Do a search on how to translate the codes on the door tag. There is a code on the tag that will specify gear ratio.

yamaha537

thats true. i didnt think of that. thanks

silver91gt

tags arent always accurate though, it is most likely a 2.73.
mine had the 3.08 tag on it, but they were 2.73.

silver91gt

after you jack up the rear and support it with jackstands put the trans in neutral. Make a mark on the driveshaft, mark the tire, and count how many times the driveshaft turns vs 1 full turn of the tire, this will give you your ratio.

nitrous_bob

door tag "ax" code

m= 2.73
z=3.08
e=3.27 (aod avail only)

i prefer 4.10's myself... but thats just my opinion based on 4 cars.... 2 had 3.73, 2 had 4.10

i'll never use anything but 4.10

yamaha537

alright thanks for your input guys. i didnt know that you could do that. what was hte benifit of the 4.10's i was thinking about that but i didnt want to loose to much top end. idk i have to look into them more so i can make my decision.

stang8689

4.10 will get you off the line quick and still not tach too high on the highway. I have 3.73's and I would rather have 4.10's

Stevens91gt

i have an aod and i love my 4.10's
stock it came with 2.73's and it was horrible

PJB

I had 4.10's installed when my car had an AOD and now its got a t5 and I still like the 4.10's. Theyre not bad on the highway at all- only 500 rpm over stock.
I was cruising just a little over 2000 rpm while doing 65 on the highway today.