Converting an open diff to a LSD?
Postmaster
Joined: Nov 2015
Posts: 4,807
Likes: 125
From: Colorado Springs
Do you have the Ford 10.25" sterling rear end? If yes then this is ONE option for you. It's a tough, predictable LSD that has a proven track record both on and off road. There are other options for sure but they all have their pros and cons.
Since I have a 2wd DRW w/350K, I'm gonna re-gear to 4.10's at the same time I do the truetrac install.
Since I have a 2wd DRW w/350K, I'm gonna re-gear to 4.10's at the same time I do the truetrac install.
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 24
From: Damon (South East Texas)
I am under the impression that your '02 F350 is an SRW model since you didn't call it a dually. My '01 F250 and a SRW F350 share the same model rear differential, a Ford/Sterling 10.5'' 3 pinion differential. The Eaton 915A550 Detroit Truetrac 10.25/10.5" 35 Spline Differential is the correct one for that application. If you have the DRW version with a Dana 80, there are 2 different options depending on gear ratio. Also, the installation instructions will vary somewhat. More information would be helpful.
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New User
Joined: Nov 2015
Posts: 15
Likes: 0
From: Southern Oregon
I am under the impression that your '02 F350 is an SRW model since you didn't call it a dually. My '01 F250 and a SRW F350 share the same model rear differential, a Ford/Sterling 10.5'' 3 pinion differential. The Eaton 915A550 Detroit Truetrac 10.25/10.5" 35 Spline Differential is the correct one for that application... More information would be helpful.
Fleet Mechanic
Joined: Nov 2009
Posts: 1,381
Likes: 192
From: Cambs, England
Looks like a Dana 80, if it has 3.73 or down gears then you need 915A567, if it has 4.10 or up there is a different part no. Is your truck a dually?
Postmaster
Joined: Nov 2015
Posts: 4,807
Likes: 125
From: Colorado Springs
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Fleet Mechanic
Joined: Nov 2009
Posts: 1,381
Likes: 192
From: Cambs, England
I would like to do the same but as mine is 4x4 it's going to be too much $ & too much work although it would be great to have a lsd up front too! There isn't much available for the front axle AFAIK. I did wonder about putting a spool up front as the only time I need 4wd is on mud or snow.
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 24
From: Damon (South East Texas)
Yes. For your year model rear axle, that is the only factory equipped option for an SRW.
Cargo Master
Joined: Jan 2005
Posts: 2,902
Likes: 2
From: Pasadena, Maryland
Sorry to dig up an old thread.......
I've got 420K on my rear axle. I purchased a TruTrac and planning to install it. My rear (axle) makes little noise, that I can hear anyway. My question is, How far should I dig into this thing? Am I safe just installing new carrier bearings and races or plan on the whole thing?
Anyone have any experiences with high mileage trucks?
TIA.....Duncan
I've got 420K on my rear axle. I purchased a TruTrac and planning to install it. My rear (axle) makes little noise, that I can hear anyway. My question is, How far should I dig into this thing? Am I safe just installing new carrier bearings and races or plan on the whole thing?
Anyone have any experiences with high mileage trucks?
TIA.....Duncan
Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
A spreader is not required. The diff can be pried out easily enough and preload is achieved by tapping in the new shim packs. It's not a terribly time consuming effort but you do pay attention to getting as close to the existing backlash value you can (plus minus 2 thou) and preload.
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