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Discussion Starter #1
Hi everyone. I recently purchased some Ford Racing 3.73 gears (8.8 rear) because they happened to be on sale at a local speed shop. However, currently my car has an 8.8 open rear... What i am very confused about is which carriers work with this car. I understand that you can make/modify a mustang carrier to work, but i would rather have a straight forward install. Therefore i have read many recommendations of obtaining an SC carrier and rebuilding it... However, could i just buy a brand new traction lock unit for a 96 T-bird? Would i need to modify anything else or buy any extra parts by purchasing a brand new unit from ford?

So far what i understand is that this is what's needed for the gear install...
1. 3.73 Gears (acquired)
2. T-lock differential (up in the air as to which part i need)
3. 21 tooth speedometer gear
4. Ford Racing Gear install kit

Is there anything that i am missing there? Also do i need a tune with the use of the 3.73's (currently have 3.27's). Thank you all again for any help you can provide.
 

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yes, you can buy a new IRS spec trac lok. Or you could get a complete SC pumpkin and get a trac lok rebuild kit and have everything done while you still have a car to drive.
 

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Discussion Starter #3
So really what would be the benefit of getting a used SC unit and having someone rebuild it? It doesn't seem like it would be very cost effective.

What do you mean by still have a car to drive? By purchasing a new unit wouldn't that come with everything one would need? Therefore, not outing the owner of their car...
 

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I think he means that while the rebuild is being done, though since he has an open diff there, it wont affect him. If money isnt an issue, buy new.
I have the diff from an early 90's S/C with 3:55 in my LX. Bought the gears used and the pumpkin used, new rebuild kit. Since installing them was beyond my mechanical expertise, I opted for the safe side and had a local speed shop do it.
 

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actually, im trying to give you a cost effective solution that provides for minimal downtime on your transportation.....

meaning, get a trac lok clutch rebuild kit, in addition to the gears, install kit, axle seals, and gear fluid and friction modifier.......

Using a used center section that already has a trac lok means that you can get one for the right price and/or finding one at the junkyard. If I didnt think it was a good idea to use a spare diff, I wouldnt have recommended it...

this is what I did.

Found a set of gears and trac lok for 75$.
TimB's old center section for free.
fluid and modifier for 25$.
misc seals for about 15$.
Labor at Reith Motorsports including using new axle seals and shims for 220$.

It was one in less than 24 hours and I didnt have to wait on my car.
 

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Discussion Starter #6
I see now. However if i go the new route (new trak lok from ford) would the parts list be as follows....

Ford Trak Lok Unit (For 96 T-Bird)
3.73 Gear Set (also ford)
Ford Racng Gear INstall Kit
21 Tooth Speedometer gear (Ford also)

BTW what is a "center section"

Thank you again for the help.
 

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center section is the diff housing itself, the "punkin".

and fluid and friction modifier.

two bottles of diff jizz is enough followed by one bottle of modifier.
 

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Discussion Starter #8
I see now. Sorry for the confusion again...

OKay final parts list

Trak lok
3.73
Speedo Gear
Install "kit"
DIff Fluid and Friction Modifier

Are the synthetic fluids any good? Such as royal purple... I remember vaguely that royal purple doesnt need the friction modifier...
 

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Discussion Starter #9
Anyone have any shift point problems stepping up from 3.27's t0 3.73's without an EEC reflash?
 

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there shouldnt be. The EEC is 'posed to compensate for a two step in gears.
 

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Discussion Starter #11
Perfect thanks again...

BTW hows the truck?
 

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Discussion Starter #13
Nice. How much of a difference does all that make on the 5.4 3v? Tune and CAI made a huge difference on my 4.6 3v
 

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