Eaton TrueTrac and Gears

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Race_Red_5Oh

Race me if you DARE
#1
#1
Hey all, just curious but I am goin to be changing my rear end up a bit and I was looking for some input. I'm gonna change the "posi" or "differential" to a 8.8" Ford Eaton TrueTrac 28 spline posi, any body have any experience with this ? And I'm still undecided on the gear ratio. I use this as a show car mostly (weekend warrior) and some occasional fun/racing Hondas etc. I'm split between 4.10's and 3.73's.

Here's the differential http://m.summitracing.com/parts/DTL-912A563

I'm planning on changing the differential mainly cause I plan to have the car for a while and this "posi" has no "clutch plates" to wear out. This way the rear end will last a while.
Thoughts and comments appreciated, if anyone lives near Levittown, NY and has this setup please post up I'd like to take a ride to see the difference between stock and aftermarket.
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Chuckie B

Chuckie B

Well-Known Member
#2
#2
I see that you own a Saleen... is it supercharged?...If its NA i would go with 4.10's...if it's just a weekend warrior the performance will out weigh the use of fuel!!...but if you have the saleen blower i would say 3.73's.
 
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03Cobra

Active Member
#3
#3
I have a TrueTrac with 3.73's and 31 spline moser axles in my Cobra (solid axle swap, narrowed 8.8 from an 01 GT). I have no complaints and still get decent gas mileage in the higher gears.
 
Unrealford

Unrealford

Well-Known Member
#4
#4
If it's supercharged,I'd go 3.73s and go 31 spline,Your gonna have it all apart and 31 isn't much more money,but is worth the option..It's a excellent upgrade,all 2005 and newer Mustangs come with 31 spline from the factory, ( GT ) models
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R

roush360r

Member
#5
#5
Unrealford said:
If it's supercharged,I'd go 3.73s and go 31 spline,Your gonna have it all apart and 31 isn't much more money,but is worth the option..It's a excellent upgrade,all 2005 and newer Mustangs come with 31 spline from the factory, ( GT ) models

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31 spline is really not needed for what the op wants. with a 31 spline diff youd need new axles so it would be quite a bit more. i have a roush thats s/c'd and i rebuilt the rear with 3.73s and reused the carrier and just replaced the clutches with the carbon fiber plates. for what you need the stock diff is fine unless your building it for alot more power
 
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