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post #1 of 25 (permalink) Old 11-25-2007, 10:56 PM Thread Starter
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Question Rear end question.

What rear end has the 3.73 gears in it? I'm going to the junkyard soon and I was wondering which car has it so I can see if I can find one along with the rear disc brake swap and front spindles/hubs. I had 2 people tell me that if I put the 3.73 rear end in my car that it will pull hard as hell.

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Horsepower is how fast you hit the wall, Torque is how far you take the wall with you......
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post #2 of 25 (permalink) Old 11-25-2007, 10:58 PM
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Only the 99 cobra unit will have what you need. Good luck you're better off having one built.
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post #3 of 25 (permalink) Old 11-25-2007, 11:01 PM Thread Starter
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Only the cobra has it? What about the SC? Someone told me that the SC rear end is pretty good also.

My old 5.0 MN12
http://www.cardomain.com/ride/2942310

Horsepower is how fast you hit the wall, Torque is how far you take the wall with you......
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post #4 of 25 (permalink) Old 11-25-2007, 11:01 PM
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yep.... very true. I love mine As for the pulling hard as hell... its more like it just smokes the tires like a mofo :/ But thats crappy tires and a 3500 stall converter. Good luck

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post #5 of 25 (permalink) Old 11-25-2007, 11:03 PM
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Quote:
Originally Posted by Triple-X View Post
Only the cobra has it? What about the SC? Someone told me that the SC rear end is pretty good also.
No thunderbird rear end was ever equipped with 3.73 gears from the factory.

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post #6 of 25 (permalink) Old 11-25-2007, 11:05 PM Thread Starter
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What rear end would be good for drag racing? I would still like it to be driveable on the street, And I really don't want to swap in a 5-Speed Trans. because I live in the city and I don't feel like shifting every 3 seconds.

My old 5.0 MN12
http://www.cardomain.com/ride/2942310

Horsepower is how fast you hit the wall, Torque is how far you take the wall with you......
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post #7 of 25 (permalink) Old 11-25-2007, 11:06 PM
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Quote:
Originally Posted by Triple-X View Post
Only the cobra has it? What about the SC? Someone told me that the SC rear end is pretty good also.
supercoupe is usually trac lock, so they are better in that sense

-Matt
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post #8 of 25 (permalink) Old 11-25-2007, 11:10 PM Thread Starter
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What would be the absolute BEST rear end to get that will bolt right up without any mods?

My old 5.0 MN12
http://www.cardomain.com/ride/2942310

Horsepower is how fast you hit the wall, Torque is how far you take the wall with you......
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post #9 of 25 (permalink) Old 11-25-2007, 11:14 PM
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Quote:
Originally Posted by Triple-X View Post
What would be the absolute BEST rear end to get that will bolt right up without any mods?
the 99 cobra unit.

-Matt
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post #10 of 25 (permalink) Old 11-25-2007, 11:17 PM Thread Starter
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Ok.... How about the second best, lol.. I'm pretty sure that the junkyards around me won't have any cobra's there, And even if they did they would most definitly be stripped down to the frame.

My old 5.0 MN12
http://www.cardomain.com/ride/2942310

Horsepower is how fast you hit the wall, Torque is how far you take the wall with you......
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post #11 of 25 (permalink) Old 11-26-2007, 12:53 AM
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post #12 of 25 (permalink) Old 11-26-2007, 12:54 AM
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if you want 3.73s, you must have them put in, along with a clutch pack rebuild on the junkyard diff.




"Booyah". Stu Scott.
1996 Braincoated, all Aluminum PI powered and obscenely loud Pearl White Tbird [email protected] AKA Dyrdek.
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post #13 of 25 (permalink) Old 11-26-2007, 12:56 AM
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Quote:
Originally Posted by The Great Obucina View Post
if you want 3.73s, you must have them put in, along with a clutch pack rebuild on the junkyard diff.
which would be the best bet considering any junkyard diff is probably long due for a rebuild.

-Matt
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post #14 of 25 (permalink) Old 11-26-2007, 08:49 AM
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Buy!

Hello

As stated the best would be purchase NEW.

I have 3.90's in mine from Motive gear. + an install kit. You can go & get a 8.8 pumpkin with a trac-lok, have that rebuilt.

Then install your New gears. Don't for get the Axle seals, They don't come in the kit.

Get yourself some SC axle shafts & have your rear hubs redrilled to the 4.5 bolt pattern.

I would buy NEW front hubs a Rotors for a mustang 99up.
Use front spindles from a 94 up T-bird. Don't forget to keep the sway bar end links & calipers. As they are different than your 92.(unless you have a SPORT).

Oh yeah. you will need a new speedo gear. to match your NEW gear ratio.

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post #15 of 25 (permalink) Old 11-26-2007, 09:25 AM
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The highest and most common track-Loc rear you can find in a MN-12 is a 3.27 in a V6 car with an automatic. The axle code is E and is on the door jamb.
The next is 3.08 which is probably what you have. the axle code for that is Y for a open rear and Z for a track-Loc rear.

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post #16 of 25 (permalink) Old 11-26-2007, 12:47 PM Thread Starter
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Around about how much would it cost to do all the stuff that tbirdless said? And just exactly what is a pumpkin? Is it the thing in the middle of the rear end that houses the gears?

My old 5.0 MN12
http://www.cardomain.com/ride/2942310

Horsepower is how fast you hit the wall, Torque is how far you take the wall with you......
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post #17 of 25 (permalink) Old 11-26-2007, 12:57 PM
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Yes pumpkin referes to the housing for the gears.

Here is how much you are looking at for a complete diff.
http://forums.tccoa.com/showthread.php?t=76934

I bought a housing from someone here for $25 and a used traction lock local for $50

I'm going to have mine done locally.
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post #18 of 25 (permalink) Old 11-26-2007, 01:15 PM Thread Starter
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I should be getting a 1992 TBird/Cougar Factory Service Manual today or tomorrow that I ordered from ebay, Would it tell me how to replace everything myself if I got the parts from a junkyard? I don't really want to spend anything over $500.

My old 5.0 MN12
http://www.cardomain.com/ride/2942310

Horsepower is how fast you hit the wall, Torque is how far you take the wall with you......
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post #19 of 25 (permalink) Old 11-26-2007, 01:37 PM
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Getting the back lash set properly is very important. If not you will shell your gears in no time. It requires a dial indicator & shims. No two rearends are the same.

Having gears put in is best left to the professionals.
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post #20 of 25 (permalink) Old 11-26-2007, 01:40 PM Thread Starter
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About how much would that cost? I figure that I can get all the parts from the junkyard for under $150 if not less.

My old 5.0 MN12
http://www.cardomain.com/ride/2942310

Horsepower is how fast you hit the wall, Torque is how far you take the wall with you......
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post #21 of 25 (permalink) Old 11-26-2007, 03:41 PM
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Call a local shop that specializes in differential repair. They may not do it since they would be dealing with used gears. Once the gear get a patern it's going to be hard to set up.
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post #22 of 25 (permalink) Old 11-26-2007, 04:36 PM Thread Starter
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If I bought some 3.73 gears, Would/Could they fit in my rear end?

My old 5.0 MN12
http://www.cardomain.com/ride/2942310

Horsepower is how fast you hit the wall, Torque is how far you take the wall with you......
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post #23 of 25 (permalink) Old 11-26-2007, 04:45 PM
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Yes you can buy 3.73 gears for an 8.8 and they will work.

Are you going to remove the diff and take it some where or take the car in? If you take the car in plan on $$$ for labor.
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post #24 of 25 (permalink) Old 11-26-2007, 04:46 PM Thread Starter
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How hard is it to remove them?

My old 5.0 MN12
http://www.cardomain.com/ride/2942310

Horsepower is how fast you hit the wall, Torque is how far you take the wall with you......
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post #25 of 25 (permalink) Old 11-26-2007, 04:57 PM
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I have never removed one but read somewhere here (don't remember where)how to do it and it does't look to bad.

I'm sure someone will chime in on how to remove it.
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