how can i tell what my stock gears are?

[russ1979]

after 217,000 miles i'm going to be changing the rear gears and adding 31 spline axles to my 88 gt. i plain on putting in 3.73's but i would like to know what is in there now. the car is almost all stock (short throw shifter, cold air and alum. drive shaft.) so i know the rear gears are the one's that ford put in.

does anybody have a Vin decoder or know where i can find out what gears i have
thanks

 

[KamiKaziDK]

You can either pull the numbers off the tag that's on your pumpkin....or you can measure how many times the driveshaft spins when you turn your wheels

 

[Beasty306GT]

You can either pull the numbers off the tag that's on your pumpkin....or you can measure how many times the driveshaft spins when you turn your wheels

+1

 

[wythors]

Look at the tag on your door. It should look something like this:

Note in the lower right corner is a box marked AX for axle. Let me know what the axle code is and I can tell you what ratio your car left the factory with.

 

[russ1979]

in the ax box there is a Z

 

[Chuckman]

z is a 3.08:1 ratio (1988 Mustang GT Decoder Form)

 

[russ1979]

sweet thanks guys

 

[KamiKaziDK]

only problem with door tags is that possibly the gears were changed at some point...but generally that's not the case

 

[bubba-dough]

only problem with door tags is that possibly the gears were changed at some point...but generally that's not the case

+1 or the door was changed. The best way to tell is jack the rear up and count the number of times the driveshaft turns compared to the tire.

 

[HISSIN50]

+1 or the door was changed. The best way to tell is jack the rear up and count the number of times the driveshaft turns compared to the tire.

+ 2. You can never assume anything about what gear ratio you have.

 

[russ1979]

the car is stock save a alum driveshaft, and cold air