rear end gearing

93GtMustang50 · Jul 24, 2010

How can I tell which gearing my 93 AOD 5.0 has in it?

347HO · Jul 24, 2010

The ID tag bolted to the case flange.
You will have to decipher it or call if you don't know the codes.

old_blue · Jul 24, 2010

if no tag then, put it in neutral, jack up rear end. spin one tire one complete rotation while watching the driveshaft flange or drive shaft and count how many times it goes around.

ex: one tire rotation and 3.75 spins on the flange is more than likely 3.73's

347HO · Jul 24, 2010

old_blue said:
if no tag then, put it in neutral, jack up rear end. spin one tire one complete rotation while watching the driveshaft flange or drive shaft and count how many times it goes around.

ex: one tire rotation and 3.75 spins on the flange is more than likely 3.73's

I don't think that will work well trying to decipher the "transmission's" gearing

notchback · Jul 24, 2010

check the door tag, under "ax"

m=2.73
z=3.08
e=3.27

thats only assuming it is stock.

if it isnt... jack it up and count rotations

old_blue · Jul 24, 2010

347HO said:
I don't think that will work well trying to decipher the "transmission's" gearing

title says rear end gearing and his first post just describes his car as a 93 mustang with an AOD and 5.0. AOD makes a difference as they came with different rear end gearing that a 93 mustang t-5 and 5.0.

At least that is how I understood it. I apologize if I am wrong though.

347HO · Jul 24, 2010

old_blue said:
title says rear end gearing and his first post just describes his car as a 93 mustang with an AOD and 5.0. AOD makes a difference as they came with different rear end gearing that a 93 mustang t-5 and 5.0.

At least that is how I understood it. I apologize if I am wrong though.

I understand now that I read it that way.

93GtMustang50 · Jul 25, 2010

i got it. thanks guys. its the 2.73....

notchback · Jul 25, 2010

old_blue said:
AOD makes a difference as they came with different rear end gearing that a 93 mustang t-5 and 5.0.

At least that is how I understood it. I apologize if I am wrong though.

your wrong. but partially right.

right due to the fact aod cars had the availability of 3.27's

but either can have 2.73 and i have never seen a 3.08 aod, i believe they were available, but for the same price you could get 3.27

fyi 3.08 was the "performance" gear offered for a t5 fox lol

93GtMustang50 · Jul 26, 2010

notchback said:
fyi 3.08 was the "performance" gear offered for a t5 fox lol

i guess the slushbox aods needed something to enhance the performance. any idea of how popular the 3.27 upgrade was?

Haus · Jul 26, 2010

my 92 came with the 3.27

I should feel lucky haha

notchback · Jul 26, 2010

93GtMustang50 said:
i guess the slushbox aods needed something to enhance the performance. any idea of how popular the 3.27 upgrade was?

theres a decent amount of them. if the car was on the lot cuz the dealer ordered it theres a good chance it has 3.27

i got my '90 GT new and it had it cuz it was on the lot. but i think my 7-up car only had 2.73 , it was swapped to 3.73 b4 i got it , but again, most of those were ordered privately and people had no idea how poorly geared the AOD is

93GtMustang50 · Jul 27, 2010

I've honestly never had a vehicle more poorly geared my my aod mustang. I used to have a 91 w/ the T5 and that was terriffic to drive, fun and squirly if you want it to be. But the AOD is boring. The 3.27 would make a huge different in the fun factor. However when I upgrade the rear, ill be going to a 3.55 sooo i guess it really doesnt matter in the long run...

Cobra912 · Jul 27, 2010

This is probably the easiest way to measure your rearend ratio, as it doesn't require removing the differential cover. Jack up the rear end of the car (so that both rear tires are off the ground) and make a mark (or pick a spot) on both the driveshaft and a rear tire. With the transmission in neutral, spin the tire by hand through one rotation, and count the number of times the driveshaft turns. The number of driveshaft rotations is your rearend ratio. (For example, if the driveshaft turns about three and a half times, the ratio is probably 3.55. If its almost three and a quarter, the ratio is probably 3.21. Almost four times, 3.91s, etc.

Note: The procedure above applies if you have a Sure Grip (limited slip) differential or a locker. If you have an open differential, the procedure is the same, but you will need to spin the tire through two rotations instead of just one.

rear end gearing

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