I can't seem to find much info on rebuilding trac loc (31 spline), find some stufff on mustang forums and they talk about some spring you push in. I have a 31 spline trac loc that after 50 miles the center block snapped in half. Got new part and I have a diagram of trac loc just no good tech on rebuilding. There are a couple of shims on the clutch pack have read don't use them. If there are shims there is some measurement that is supposed to be meet. Anyway can't find any detailed info. Anyone got a link?

Google is your friend

ford trac lok rebuild

YouTube - Ford 8.8" rear end Traction-Lok clutch setups (http://www.youtube.com/watch?v=0GsLDg3C6Hc)

Pull all your existing clutches, and plates. The clutches are the ones with material on them and the plates are just the metal ones.

Measure all your clutches to find out which one is the thickest from each side. Keep the two (one from each side) thickest ones. You'll need these shortly....

When you take the stock pieces out, it will look like this:
C-P-P-C-P-P-C (C=clutch P=plate)

When you go to install them do this instead using the two old clutches:
C-P-C-P-C-P-C

Obviously you'll have an extra Plate left over, but don't worry about it. When you go to shim the side clutch packs, put in the thickest shims you can get away with and still be able to get the spider gears back in. On the last diff I did, it took alot of persuading with a brass drift and a big hammer....Make sure that the spider gears still have their cups on the back side when installing them. If you can't get the spider gears in, start stepping down both side shims in equal sizes until you are able to get them in place.

The use of friction modifier is up to you. If you're using synthetic lube, then most likely the gear oil already has it built in. The instructions say to soak the clutches in friction modifier overnight or at least a few hours to be sure they're not dry when they are installed. If you want a tighter action in the differential, don't use the friction modifier. Friction modifier just makes the oil more slippery and thus allows the clutches to slip sooner, but if you do this then you should be aware that the clutches will probably not last as long. If you don't want to use the friction modifier, just soak the clutches in whatever oil you're going to use when the differential is assembled.

Basically what you're doing is pre-loading the clutch packs more than stock, and allowing the clutches more surface area to bite into. I have never had a problem with this setup, and it locks up way faster than ever before (I would be doing this in my Ranger, but I've got an Explorer axle going in with a selectable locker).

Interesting tip.

Makes sense. Thanks! :smokin:

I guess JBG sold me something diffrent I ordered 31 spline trac loc but is nothing like that youtube clip; but thanks anyway.

Here is a good step by step write up, I just did mine the other day and it was pretty straight forward.
http://www.bmcforums.com/showthread.php?p=1416589

thanks for the replys but still not what I have the basic idea is the same but here is what I have:

http://broncograveyard.com/dia/6/fo9diatraclok.jpg