Posi Traction

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Nov 2, 2020 | 01:20 PM

Chase Sharp

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Posi Traction

I have a 1994 Ford F-150 5.8L V8 (351). I was wondering if it has posi traction?

Nov 2, 2020 | 01:38 PM

GNR22

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From: Central Wisconsin

2 ways to tell. In the driver's door jamb, the tag should list an axle code. The axle code will tell you if it is a limited slip carrier. There should also be a small metal tag on the rear differential cover with the gear ratio. Many times this tag is gone or illegible so it is easier to just use the axle code on the door jamb.

Nov 2, 2020 | 04:09 PM

rla2005

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From: Kentucky

Check the Axle Code listed on the b-pillar door jamb sticker.

If the Axle Code begins with a letter it's a factory limited slip rear axle.

Nov 2, 2020 | 04:13 PM

Nothing Special

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From: Roseville, MN

Literally? No, it doesn't. Positraction is the name for a limited slip made by Eaton. Chevy used it, but Ford used TractionLok (or TracLoc or some other spelling variant).

But to see if you have a limited slip diff you can also jack up both back tires. With the trans in gear (or an auto in park) try turning one. If it turns pretty easily and the other tire turns backward it's either an open diff or a completely worn out limited slip. If it's hard to turn it's either a limited slip or a dragging brake.

Then put the trans in neutral. If it's still hard to turn it's probably a dragging brake. If it turns and the other side turns the same way it's probably a limited slip. And if it turns and the other side turns the opposite way it's probably an open diff.