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Discussion Starter #1
Has anyone rebuilt their Ford 3.73 limited slips, put in new oil, still does't work. had heard Ford puts in to much modifier,thats why the oil change. was wondering about an after market unit, any suggestions?:dunno:
 

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I haven't heard that ford puts in too much fiction modifier. If you have a single rear wheel, you have the 2 pinion 10.25 or the 3 pinion 10.5 depending on if you have a obs or superduty (just fyi).

If it isn't working, you probably burnt out the clutches. You can rebuild them. Contact JT's at 866-349-6801 or JTs Parts & Accessories, Justdifferentials.com. I bought a yukon kit for under $200. For another $200, I had mine rebuilt using extra discs and refilled with Amsoil.



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Discussion Starter #3
2003, 2 wheel bought PSD last Aug. with 73,000. on a thread here on the org. someone said to much modifier!!! thats why the oil change. will check some prices for parts
 

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is that kit listed on their site? I cannot find it...I'm tired of the one wheel peel

Luke
 

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is that kit listed on their site? I cannot find it...I'm tired of the one wheel peel

Luke
I have no clue. If you have a posi unit that isn't working, they do have a kit. I just called them and ordered it. If you have a "open" diff, I believe they sell different setups for the sterling also.

One thing I didn't mention, I had a bearing kit already, so I didn't add that cost to my original post.



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If you tear into the rear, put one of these covers back on.. They are only about $40. Its for a 2008 superduty and has a finned aluminum diff cover. Part number 8C3Z-4033-A

You will need new bolts however, as the bolts on the stamped steel diff covers arent long enough. Bolts stainless hex head 5/16 18, 1 1/4 inch long. Use stainless lock washers. Blue locktite to 20 ft.lbs


 

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Does thatjust keep the rearend cooler I assume by looking at the fins?

Luke
 

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ok thanks...so if I call justdifferentials they can hook me up with the rebuild and extra clutches like you have?

Luke
 

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I believe so. If I remember correctly, all kits come with a few extra clutches and metal shims. It's just the way you install the clutches/shims that add surface area on the end of the pack by the bearing. I may be wrong, I'm trying to picture the trac lok in my head and it's a bit fuzzy. :) I have an extra 3 pinion trac loc in my garage, but it's buried and I haven't seen it in ages. Also, I had a heavy truck gear and axle shop do the rebuild because I'm lazy these days.

I just mentioned the Yukon setup because that's what I bought and I'm happy with it. I have about 20k on the rebuild with no problems yet. Off idle, I have equal length dark black lines when I put the hammer down. Needless to say, I don't always baby the truck.



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Discussion Starter #11
7.3 limited slip

I have no clue. If you have a posi unit that isn't working, they do have a kit. I just called them and ordered it. If you have a "open" diff, I believe they sell different setups for the sterling also.

One thing I didn't mention, I had a bearing kit already, so I didn't add that cost to my original post.
What was your price? found a clutch pack at (drivetrainspecialist.com) for $204.40, i guess plus shipping. their phone # 1-800-521-0628.
I haven't ordered yet still looking for prices. I think mine is a 10.5 sterling 3 pinion
 

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Discussion Starter #13 (Edited)
Just found my Ford repair manual CD. The Truetrac and Trac-Loc can not be repaired! but the Traction- Loc can be repaired, but you need a special fixture to hold the pack to set the correct thickness of the clutch pack. I am looking at a 2003 SuperDuty
 

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Just found my Ford repair manual CD. The Truetrac and Trac-Loc can not be repaired! but the Traction- Loc can be repaired, but you need a special fixture to hold the pack to set the correct thickness of the clutch pack. I am looking at a 2003 SuperDuty
The posi unit in the 10.25 and 10.50 (2 pinion and 3 pinion) SRW can be rebuilt. Been done many times. You can even call your local ford house, give them your year model and axle tag and they will be able to track down the parts (they were $50 higher than everyone else in my area).


I went the rebuild route, because the posi seems more forgiving when towing large amounts of weight. If you are looking for a replacement to the standard sterling posi, look at the detroit tru trac (I think that's what it's called). Stealth Automotive has them and Raul is a vendor on this forum.



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