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Either use the seach to find the door jam letters or numbers to identify what came with your car or jack up the rear end and write the info on the tag down and call ford with it - they'll tell you. you can tell if you have trac-lok or open rear end by spinning on of the wheels while the rear end is jacked up - if both turn the same direction your axle is trac-lok, if the other wheel spins the opposite direction you are turning then the axle is open and the wheel with less resistance will spin.
 

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It ain't "POSI" unless you have a chevy differential in your Ford housing! Fords have a Traction-Lok (Trac-Lok) differential. Both are clutch type limited slip differentials though.

68COUGAR
 

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What's really weird is that my door code is a Y, yet when I've gone to light 'em up, I've left dual black marks. I'm fairly sure of it cause I've looked back to check them. Plus on every other vehicle I've had, I've gotten wheel hop as it switches back and forth. This one doesn't seem to do that. How is that possible? I'm rather confused now.
 

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even without a t-lok u can still leave 2 black marks.. it just depends on how much traction that other wheel has... if u can... jack up the back of the car and put the car in neutral and spin the wheels, if the wheels spin the same way then u have a t-lok, if they spin opposite ways, then obviously u dont,

hope this helps u figure it out
 

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I'll definitely try that next time I get a chance. Don't have a way to really jack it up right now, but if I can get it to a shop to do something else, I'll give em a spin while it's up.
 

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That's why I said that I would do it next time I have it in the shop and the whole thing is off the ground on the lift.
 

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put a jack under the differential and lift the whole back of the car at once, or like u said, just use a lift
 

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So with both wheels off the ground they will both have an equal amount of traction and will both spin..... and you still won't know if you have track lock or not.
 

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Avatar28 said:
Ah, but if they spin the same way I do. If they spin DIFFERENT ways, I don't (or it's busted).
When my Trac-Loc was used up, the drivers side wheel would rotate the passenger side wheel, but the passenger side wheel would NOT rotate the drivers side wheel. Anything other than the desired indication is BAD!!!!

68COUGAR
 
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