Limited Slip Differential

No stock Mark VIII came with an LSD. Being able to spin both tires doesn't mean you have one, either.
 
The only traction device the car came with (as an option) was a primitive traction control system called Traction Assist. (uses ABS to brake a spinning wheel, but system is only operative up to a certain speed)

The differential itself is a 3.07:1, 8.8'' open unit. An LSD can be added, though.

An open differential can spin both wheels in a straight line if traction (or lack of) is equal on both sides, but cannot spin both if there is much difference in traction.

So, if your car can consistently spin both it's wheels on any surface, the differential isn't stock.
 
Brake stand it for a few seconds then move foreward and launch it hard. I bet only one wheel spins.
 
I guess he could try chocking the front wheels, put in neutral, jack up the back and turn one of the wheels by hand - if the opposite wheel turns the other way, no Traction-Lok (or inoperative) If both wheels turn same way, Traction-Lok (if installed) is working.

I don't know if the above works on all LSD types - unlikely? But, from looking at how a Traction-Lok works, (clutches keeping both sides locked until a certain % force overcomes said clutches and causes them to slip) it should.
 
I am fairly sure in a viscous limited slip like the Trac Lok that the clutches normally slip and when there is a difference in wheel speed that clutch side slips more causing it to heat up and then the clutches grab more. Thats what the friction modifier is there for, to make that happen.

I could be way off. I read allot but I also smoke allot. :lol:
 
93' Blue on blue said:
A viscous LSD is a different type of unit altogether. The Traction-Lok is a clutch type.

Read this, see if it makes much sense:

http://auto.howstuffworks.com/differential4.htm

My understanding of friction modifier is to make the clutches slip more - reduce wear and chatter on cornering.
Click to expand...
Yup, im pretty dumb. :D

I thought a viscous was a clutch type. I thought there was only open carriers, viscous/clutch LSD, geared LSD and then spools/lockers.
 
I'd like to see various LSD's working (or at least some animations of them working) before I fully understand them, myself.
 
Get lockers if your serious about really hooking up your car. If not the traclok is a good investment. Be prepared to replace clutches if you have fun like I do.
 
Unless a previous owner swapped in a trak-lock you have an open diff...which will spin both tires, but that doesnt mean full power is being applied to both wheels.

The only real way to tell is the jack up the car and spin one tire method mentioned above.
Anything else is pure speculation.
 
My Mustang GT has LSD and when I jack up the car and spin one tire the other tire spins the other way.
XLRVIII said:
Unless a previous owner swapped in a trak-lock you have an open diff...which will spin both tires, but that doesnt mean full power is being applied to both wheels.

The only real way to tell is the jack up the car and spin one tire method mentioned above.
Anything else is pure speculation.
Click to expand...
 
this is what a stock rear end burnout looks like

DSCF1198.jpg
 
please tell me you dind't do that in front of your own house. I learned not to do that the hard way lol. "I swear I dont know how all the rubber got on your truck dad" lol
 
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