[-Joeyy-]

my friend has a stock rear in his mustang i think it is lsd not sure ( when u spin one tire the other goes in the opposite direction and it has 3.43 gears or some thing.

he bought a another rear with locked diff or posi or what ever and it has like 2.73 gears im just estimating the gears i am not 100% sure it is that.

He is wondering if its worth changing the rear?

but he wants both tires to spin when he burns out 99% of the time.

is it easier to swap the gears then put in 3.73's then to convert his limited slip to locked diff/posi

please respond asap hes waiting on the reply thanks guys.

[-Joeyy-]

cmon guys i need help

[HMUSN]

what year is his stock mustang? and is it a v8 or a v6?

[-Joeyy-]

88 mustang GT auto t-tops

[1slo5.0]

Originally Posted by -Joeyy- my friend has a stock rear in his mustang i think it is lsd not sure ( when u spin one tire the other goes in the opposite direction and it has 3.43 gears or some thing. he bought a another rear with locked diff or posi or what ever and it has like 2.73 gears im just estimating the gears i am not 100% sure it is that. He is wondering if its worth changing the rear? but he wants both tires to spin when he burns out 99% of the time. is it easier to swap the gears then put in 3.73's then to convert his limited slip to locked diff/posi please respond asap hes waiting on the reply thanks guys.

Limited slip, posi and traction lock is all the same thing. If the tires spin in opposite directions then it is either an open differential or a burned out traction lock.

[1slo5.0]

Originally Posted by -Joeyy- 88 mustang GT auto t-tops

All 86 and up Mustang GTs come with a traction lock differential from the factory.

[-Joeyy-]

Originally Posted by Darrell All 86 and up Mustang GTs come with a traction lock differential from the factory.

im still confused as to what my friend should do. his mustang does not use both tires when he burns out. i know this for a fact i see it with my own eyes.

thx for the reply's

[1slo5.0]

Originally Posted by -Joeyy- im still confused as to what my friend should do. his mustang does not use both tires when he burns out. i know this for a fact i see it with my own eyes. thx for the reply's

The traction lock is burned out and needs to be rebuilt.

[-Joeyy-]

so what should he do have his current rear rebuilt or just put in this other older rear that is posi and just upgrade the gears? or just take a 1.0 gear ratio loss by swapping. sry if this sounds a bit confusing

p.s. he already purchased this new rear.

[1slo5.0]

Originally Posted by -Joeyy- so what should he do have his current rear rebuilt or just put in this other older rear that is posi and just upgrade the gears? or just take a 1.0 gear ratio loss by swapping. sry if this sounds a bit confusing

First we need to get some facts straight. I keep see you refering to posi, traction lock and limited slip as different things. They are all the same thing. They are all clutch type differenentials. The terms Traction Lock, Posi, limited slip, etc are all names given by different manufacturers for the same device. There are 3 different types of rear ends and they are an open type, limited slip and a spool. Open and limited slip are available from the factory and a spool is not.

Your buddy can rebuild his traction lock. The parts cost about $60.

[-Joeyy-]

Originally Posted by Darrell First we need to get some facts straight. I keep see you refering to posi, traction lock and limited slip as different things. They are all the same thing. They are all clutch type differenentials. The terms Traction Lock, Posi, limited slip, etc are all names given by different manufacturers for the same device. There are 3 different types of rear ends and they are an open type, limited slip and a spool. Open and limited slip are available from the factory and a spool is not. Your buddy can rebuild his traction lock. The parts cost about $60.

ohh ok what is the difference between open, limited slip, and spool?

i know spool is full power to both wheels 100% of the time.


wait i think i get this just correct me if im wrong i am using the term posui to refer to both tires spinning and that is wrong so what term do i use locked diff?

[M L Struck]

Even if the trac-loc is burnt up, the tire will spin the same direction so you must have the wrong diff in it . take the other rear you bought put new gears in it (3.73-4.10) don't forget friction mod aditive and put it in.

[1slo5.0]

Originally Posted by -Joeyy- ohh ok what is the difference between open, limited slip, and spool? i know spool is full power to both wheels 100% of the time. wait i think i get this just correct me if im wrong i am using the term posui to refer to both tires spinning and that is wrong so what term do i use locked diff?

Open means one tire spins....the tire with the least amount of traction which is usually the passenger side tire. There is no device inside the differential to equally apply the power to both tires.

A limited slip (or whatever other of the 1000 names it has including posi) has clutch packs or another mechanical device in it that applies power to both tires. The limited slip type differentials also allow the tires to spin at different speeds when turning corners so axles don't break, tires don't wear out, etc.

A spool is a fully locked rear end. Both axle shafts are connected to a solid device that locks them together. The axles will always spin at the same speed. Not recommended for street use, especially if you don't have aftermarket axles.

[-Joeyy-]

Originally Posted by M L Struck Even if the trac-loc is burnt up, the tire will spin the same direction so you must have the wrong diff in it . take the other rear you bought put new gears in it (3.73-4.10) don't forget friction mod aditive and put it in.

that's what i figured Darrel is damn smart with cars so im gona have to to see. maybe wait on a few more replys.

thanks a lot tho bro for the reply

[-Joeyy-]

Originally Posted by Darrell Open means one tire spins....the tire with the least amount of traction which is usually the passenger side tire. There is no device inside the differential to equally apply the power to both tires. A limited slip (or whatever other of the 1000 names it has including posi) has clutch packs or another mechanical device in it that applies power to both tires. The limited slip type differentials also allow the tires to spin at different speeds when turning corners so axles don't break, tires don't wear out, etc. A spool is a fully locked rear end. Both axle shafts are connected to a solid device that locks them together. The axles will always spin at the same speed. Not recommended for street use, especially if you don't have aftermarket axles.

ok i think we are on the same page now thanks for clearing that up.

My friend has a open diff because when we jack the car up and spin one tire the other tire spins in the opposite direction.

my friends right tire is bald as a Q cumber and his left looks like new.

[1slo5.0]

Originally Posted by -Joeyy- that's what i figured Darrel is damn smart with cars so im gona have to to see. maybe wait on a few more replys. thanks a lot tho bro for the reply

Pull the cover off the differential. It is easy to tell the difference between an open and limited slip differential.

As far as the wheels turning in opposite directions, I had a rear end that I thought was an open rear end once because the tires turned in opposite directions. I opened it up and it was indeed a traction lock that was burned out. So that bit of information about traction locks always spinning in the same direction is not correct.

[1slo5.0]

Originally Posted by -Joeyy- ok i think we are on the same page now thanks for clearing that up. My friend has a open diff because when we jack the car up and spin one tire the other tire spins in the opposite direction. my friends right tire is bald as a Q cumber and his left looks like new.

The only way to know what you have is to pull the cover off and verify.

[-Joeyy-]

ok but all this work... you dont think it would be easier to just swap the rears and upgrade the gears?

he would want to upgrade the gears in his stock rear any way.

[M L Struck]

Darrell is correct the only wat to be 100% sure is to look and the chance that a GT car has a open rear end is pretty slim so get gears and a clutch kit and go to town

[1slo5.0]

Originally Posted by -Joeyy- ok but all this work... you dont think it would be easier to just swap the rears and upgrade the gears? he would want to upgrade the gears in his stock rear any way.

What happens if the other rear end needs to be rebuilt? Then you have to do the work anyway. Swapping gears is harder than rebuilding the traction lock. If it was me I'd rebuilt it so I know it is good.