What do I need to run 3.73's?

larryford · May 12, 2005

Have a '94 GT with AODE. What do I need to do to be able to change from 2.73--to 3.73?

thanks SN

GRGT1994 · May 12, 2005

You mean to do it yourself, or as in supporting mods.

If you mean to do it yourself, you need basic tools including jack stands (of course). But more importantly you would need a dial indicator with magnetic stand, and a precise caliper to measure your pinion head and shims. And you should get a rear end rebuild kit.

If you mean what supporting mods do you need with the gears, well ... nothing. You may want a beefier torque converter and a shift kit. But you do not need those with just 3.73s. Think more about 4.10s.

urban96 · May 12, 2005

correct speed-o drive gear, $8 at 50resto.com

Jack's95gt · May 12, 2005

With a rear that's a 100% you would only need a ring and pinon gear and a shim kit. Special tools would be a dial indicator and a magnetic base for setting the backlash. If you use Ford gears you can use the same shims on the old pinon gear on the new one and your pinon depth will be close enough. You would need access to a bearing puller and a press to install your bearings. You need an inch/lb torque wrench to set your preload on the pinon bearing.

Other things that you may want to do are to rebuild your traction lock unit and change the carrier bearings.

I recommend a shop to do this job. It's one on the toughest jobs to do on a car.

GRGT1994 · May 12, 2005

Jack's95gt said:
I recommend a shop to do this job. It's one on the toughest jobs to do on a car.

Tougher than rebuilding an engine bottom end?

sawbones25 · May 12, 2005

GRGT1994 said:
Tougher than rebuilding an engine bottom end?

Hell yeah...

GRGT1994 · May 12, 2005

sawbones25 said:
Hell yeah...

Wow, maybe I'll have to think about lining up a major engine rebuild this next winter then!

WhiteStallionGT · May 12, 2005

All you need is an 8.8 rear end (which you already have) and your set dude. Just get that correct speedo gear so your speed won't be off.

GRGT1994 · May 12, 2005

If its a T-5, you can't correct for 3.73 gears with only a speedo gear. You will need the tranny gear too.

CHeck here for the proper speedo gear. http://www.muscularmustangs.com/gears.php

94-302-vert · May 13, 2005

I went with the borhters speed cal.

DO NOT USE THE ORIGINAL PINION BEARING AND RACE...

My shop advised me to do this as I was watching costs and now I am bringing it back for a full rebuild (all 6 bearings and all seals). It is not worth it. I will lose my car for another day, but at least he is giving me a good deal on the labor this time around since it was both of our faults.

Chris

slytherin · May 13, 2005

It's not a job for the shade tree mechanic, take it to a qualified shop.

Jack's95gt · May 13, 2005

GRGT1994 said:
Tougher than rebuilding an engine bottom end?

I have done both and the engine isn't that difficult at all. Feeler gauge and a torque wrench are just about technical, as you need to get with an engine bottom. In the Hanyes' auto repair manual you'll most likely find the procedure for engine rebuilding, but not for differential service.

One of most diificult deals is to get one of our engines to a decent idle after a performance cam has been installed.

sawbones25 · May 13, 2005

It takes more time to pull a motor and rebuild it, but technically it's not difficult.

GRGT1994 said:
Wow, maybe I'll have to think about lining up a major engine rebuild this next winter then!

igotyofire · May 13, 2005

GRGT1994 said:
If its a T-5, you can't correct for 3.73 gears with only a speedo gear. You will need the tranny gear too.

CHeck here for the proper speedo gear. http://www.muscularmustangs.com/gears.php

where do u get the tranny gear from?

urban96 · May 13, 2005

www.50resto.com

RIO5.0 · May 13, 2005

94-302-vert said:
I went with the borhters speed cal.

DO NOT USE THE ORIGINAL PINION BEARING AND RACE..

I'm not sure on that one...plenty of people dont do that.. high miles, yes I would swap all the bearings out..
I had 52k on mine...added 355's with everything re-used, including the same crush collar...ran that to 68k, swapped it all over again to use 373s...now at 72k its still dead quiet...

larryford · May 15, 2005

I was not very clear

About going to 3.73 with my AODE. What I meant is the computer going to get confused about the difference in the rear gear??

thanks

Venom351R · May 15, 2005

larryford said:
About going to 3.73 with my AODE. What I meant is the computer going to get confused about the difference in the rear gear??

thanks

no your computer has nothing to do w/ your read end as far as monitoring it. The only thing that will be off is your speed if you dont get a correct spedo gear.

igotyofire · May 15, 2005

im confused do u need a tranny gear and speedo gear or just the speedo gear?

Venom351R · May 15, 2005

igotyofire said:
im confused do u need a tranny gear and speedo gear or just the speedo gear?

I think some people are refering to it as the same thing but calling it 2 diffrent names. All I did was get the correct spedo gear ( which goes in down near the tranny) and my MPH are right on.

What do I need to run 3.73's?

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