crewcutkid

Just out of curiosity, does the 8.8 in the GT have the traction lok diff?
Thanks,
-Jim

70MACH1OWNER

Kind of..It is called "limited slip" It is not a true posi unit.

crewcutkid

Ok, thanks Scott! Just wanted to find out. As a gift to myself (for enduring so many accidents) I'm gonna purchase a traction lok rearend, 3.73 gear and axle girdle, after I get the bodywork done.
-Jim

Cavero

That's funny, the axle on my 06 GT is Traction Lok

70MACH1OWNER

This is true. It is called a traction Lok limited slip differential. It's kind of a play on words. Our 8.8 differentials use a series of clutch packs to transfer the power to the axles. It allows the rear wheels to turn at different speeds when going around corners. Not to be confused with a true posi unit that has no clutches and drives both axles at the same speed. These units are only good for straight line use. They are like driving a 4x4 on dry pavement. An Auburn differential uses a cone clutch type setup and is stronger than our stock units but is also considered a limited slip differential I believe.

fordcrazy

70mach1owner

Great discription , most people have a hard time with that , but you made it simple enough for everyone .

whiplash stang

Would getting a Detroit TrueTrac Locker solve the issue I'm having with only my D/S tire spinning most of the time when doing a burnout @ the track. Tread on D/S is less than on P/S on my Nitto 555R drag radials. Do others have this issue. Any comment is appreciated, thanks.

ManEHawke

Posi traction does use disc clutch packs. These were used mainly on GM's and is their equivalent to our T-lok. Eaton makes the Posi units. The Eaton Posi LSD.

It's the same thing with different terms from different manufactures and companies.

The term posi is now associated with many types of differentials as a label that its an LSD.

I would get a worm gear type differential like the Torsen, or the Tru-trac. You can also get a more aggressive ratchet type like the detroit locker.
The factory t-lok does an adequate job, but does seem to favor one wheel slightly.

heres my burnout, launch. And my friends badass GT500. My driver tire seems to spin quicker. http://www.youtube.com/watch?v=L-fNHYwPynQ

70MACH1OWNER

You are correct I guess. The term posi-traction rear end has been banged around for years. It does depend on what manufacturer, make of car and so on as to what it really means today. It really is a play on the phrase to me. I guess I'm just old and the true meaning of posi-traction to me is a spool type rear end with no clutch packs, worm gears or anything else. Just solid steel coupling the axles to the ring and pinion. That is true posi-traction.

Cavero

Yep. Pretty clear now

jlmounce

What 70MACH originally described is a locker or spool. Where the two axles are permanently locked together and not allowed to rotate at independent speeds.

Whiplash Stang, it sounds like you simply need a T-Lock rebuild. More than likely the clutches in your differential are worn out and needing replacement. The first real sign of this is tendency towards sending power to one wheel (like an open differential).

If you race often but not enough to justify a spool, you may consider going with a more aggressive rebuild. You can pack more clutches in the unit slightly tighter which will give your axle more clamping force for burnouts with sticky tires etc.

I can't recall the arrangement of clutch's off hand, but if you serach around the mustang boards you should be able to find that information.

Novelty goat

Posi-traction is just what GM called their limited slip diffs. They were not true locking diffs.

crewcutkid

Now then, I do have one more question concerning the Traction-Lok diff. It specifies 31 spline axles- is that what is in 05+ GTs, or would I have to change the axleshafts as well to put a new differential in?
Thanks!
-Jim

69Mach1-409

05+ GT's have 31 spline axles from the factory, so you should be good.

Centurion96

The 31 spline Trac-Loc has been used in the Mustangs, F-150s, and full sized Broncos. I am not a fan as it is a weak design. I've attached a link to a previous post concerning the Trac-Loc with photos. My experience using these in Broncos is as follows:

1988 Bronco 302CI 3.55LS 5-speed manual and 31x10.50R15s - Driving home from work I start hearing a clicking under acceleration and when I would make turns. As I'm pulling up the driveway the Ford TracLoc differential housing splits open and locks up the rear axles. Poorly designed 8.8" LS where Ford machined most of the metal away to allow for the clutch packs.

1996 F-150 SuperCab converted to a 4 door Bronco 351CI 3.55LS E4OD and 31x10.50R15s. Again clicking under hard acceleration and turning. This time I wasn't as lucky as the TracLoc let go 3 miles from home and I ended up pushing a tow truck home. Same exact failure on the TracLoc.

I run an Auburn Pro in my Centurion now as it can handle the forces a 6K lb truck puts on the rearend.

https://themustangsource.com/showpos...03&postcount=5

Here's a teaser from that page. Please note the white chalk as that is how thin these rearends are machined down for the clutches.





BB
Semper Fi

NastyStang113

525 rwhp & 501 rwtq, 305 drag radials, upgraded clutch, and dropping the clutch at 4,000 RPMs at the track and my OEM limited slip has held up great.

crewcutkid

Jason, thanks for the clarification!
Bob, I'm sorry to hear you have had problems with your differentials- sounds like Auburn got you fixed right up!
NastyStang- sounds like you have one quick car!
-Jim

69Mach1-409

Np!

Five Oh Brian

Trivia time. Ford has installed a limited slip "Traction-Lok" 8.8" rear end in all V8 Mustangs since 1985. And, starting with the 2011's, Ford will now be installing a Traction-Lok rear end in all V6 Mustangs, as well.

crewcutkid

Great to know, thanks, Brian!
-Jim