Do I have posi?

Bad89stang · 11-28-2001, 12:40 AM

I jacked the rear of my car up and spun one of the wheels. The other wheel turned in the same direction at the same time. Posi? My guess is that it is. Please help. My understanding is that with an open or non-posi rear end, the other wheel will stay stationary or spin in the other direction.

PKRWUD · 11-28-2001, 06:38 AM

That would be correct.

Take care,
-Chris

Mr 5 0 · 11-28-2001, 02:32 PM

All 1986 and later V-8 Mustangs have an anti-slip differential.

Ford calls it 'Traction-Lok', GM calls it 'Posi-Traction' (Where the term posi originated).

Same basic principle.

Mustang_289 · 11-28-2001, 04:14 PM

I've got a stock 88GT that I've been told has a limited-slip rear in it and was explained to me that the other wheel will lock in and provide traction when needed. Is this correct - if not could someone let me know.

When I had my car on jacks - I spun one of the wheels and the other one did move in the same direction - but when I put some pressure on the other wheel it stopped.

Mr 5 0 · 11-28-2001, 05:24 PM

Mustang_289:

Your Mustang should have the limited-slip diff.

Try this test:

Take it out on an empty road. Stop, rev it up high, pop the clutch and floor that sucker. After the burnout, go back and check the road. Two black stripes means your Traction-Lok is working, one stripe means it isn't and is probably in need of a rebuild. They don't last forever but can be repacked and adjusted for a reasonable price.

PKRWUD · 11-28-2001, 08:40 PM

Jim has touched on a big misunderstanding that alot of people have, and i just want to elaborate a little. A limited slip rear end and a posi rear end are the same thing. As Jim mentioned, GM's pet name for their performance oriented rear end was posi-traction. One wheel was always driven, and if it started to slip (spinning), the other wheel would grab, thus the name limited slip. When the rear end is up in the air, and you rotate one tire, the other will usually rotate the same direction, but it doesn't have to, and it can still be posi. If you were to have a friend hold the other wheel, you can still spin yours, by hand, but if you were driving it with the engine, your friends hands wiuld get burned because his tire would grab after yours spun. Regular rear ends, like those in most passenger cars, have only one driven wheel, no matter what. They will always rotate in opposite directions when elevated.

I hope this helps!

Bottom line, Posi and Limited Slip are the same thing (unless you enter the world of welded axles, where they always rotate together, under power).

Take care,
-Chris

Mustang_289 · 11-28-2001, 08:41 PM

Now that's a test I certainly would enjoy doing!!!!

11-28-2001, 12:40 AM	#1
Bad89stang Registered Member Join Date: Aug 2001 Location: Ft. Worth, TX Posts: 456	Do I have posi? I jacked the rear of my car up and spun one of the wheels. The other wheel turned in the same direction at the same time. Posi? My guess is that it is. Please help. My understanding is that with an open or non-posi rear end, the other wheel will stay stationary or spin in the other direction. __________________ You're gonna need your seatbelt

11-28-2001, 06:38 AM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	That would be correct. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

11-28-2001, 08:40 PM	#6
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Jim has touched on a big misunderstanding that alot of people have, and i just want to elaborate a little. A limited slip rear end and a posi rear end are the same thing. As Jim mentioned, GM's pet name for their performance oriented rear end was posi-traction. One wheel was always driven, and if it started to slip (spinning), the other wheel would grab, thus the name limited slip. When the rear end is up in the air, and you rotate one tire, the other will usually rotate the same direction, but it doesn't have to, and it can still be posi. If you were to have a friend hold the other wheel, you can still spin yours, by hand, but if you were driving it with the engine, your friends hands wiuld get burned because his tire would grab after yours spun. Regular rear ends, like those in most passenger cars, have only one driven wheel, no matter what. They will always rotate in opposite directions when elevated. I hope this helps! Bottom line, Posi and Limited Slip are the same thing (unless you enter the world of welded axles, where they always rotate together, under power). Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

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11-28-2001, 02:32 PM	#3
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	All 1986 and later V-8 Mustangs have an anti-slip differential. Ford calls it 'Traction-Lok', GM calls it 'Posi-Traction' (Where the term posi originated). Same basic principle.

11-28-2001, 04:14 PM	#4
Mustang_289 Registered Member Join Date: Sep 2001 Posts: 512	I've got a stock 88GT that I've been told has a limited-slip rear in it and was explained to me that the other wheel will lock in and provide traction when needed. Is this correct - if not could someone let me know. When I had my car on jacks - I spun one of the wheels and the other one did move in the same direction - but when I put some pressure on the other wheel it stopped.

11-28-2001, 05:24 PM	#5
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	Mustang_289: Your Mustang should have the limited-slip diff. Try this test: Take it out on an empty road. Stop, rev it up high, pop the clutch and floor that sucker. After the burnout, go back and check the road. Two black stripes means your Traction-Lok is working, one stripe means it isn't and is probably in need of a rebuild. They don't last forever but can be repacked and adjusted for a reasonable price.

11-28-2001, 08:41 PM	#7
Mustang_289 Registered Member Join Date: Sep 2001 Posts: 512	Now that's a test I certainly would enjoy doing!!!!