Rear Axle Question(s)
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Trailering
Joined: Jul 2006
Posts: 17
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Rear Axle Question(s)
I have a 2000 XLT 4x4,CC, LB completely stock with 280K on the odometer. I've been getting what I consider excessive rotational play in the rear pinion and am planning to to give the axle a rebuild this spring. In prepping, I learned the axle is a 3.73 non-limited slip axle (S406H according to the tag). I've also located a few 3.73 limited slip (S409H) axles on fleabay (these seem to as rare as hen's teeth in the PNW lateley) and am considering buying one to rebuild and upgrade the truck a bit. Has anyone else done this swap? Pitfalls? Alternately, can the S406H be converted to a limited slip axle? Has anyone else done this mod to a 406 axle? Pitfalls? Thanks in advance.
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
I don't know for certain but I believe that they are interchangeable, both the gears and the entire axle. I have an LS axle in the garage that I expect to just swap out into mine, if I ever get motivated on it.
Laughing Gas
Joined: Aug 2006
Posts: 1,002
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From: SW ON, Canada
Charlie, the factory limited slip LS (S409S) are not that great and over time, lose their ability to operate the way they should. A lot of guys put in an aftermarket LS unit like a Detroit Tru Trac and they swear by them. Use the search function and have fun reading ... lots of good threads on this topic.
Logistics Pro
Joined: May 2017
Posts: 3,523
Likes: 483
From: Southern OH
Charlie, the factory limited slip LS (S409S) are not that great and over time, lose their ability to operate the way they should. A lot of guys put in an aftermarket LS unit like a Detroit Tru Trac and they swear by them. Use the search function and have fun reading ... lots of good threads on this topic.
Logistics Pro
Joined: Nov 2006
Posts: 3,674
Likes: 367
From: Fallon,NV & Bainbridge OH
I agree, buy the above mentioned Detroit or Eaton TruTrac and install it in your diff with new bearing and seals. A lot less work than swapping diffs, cheaper than buying another diff and then trying to unload your non-limited slip and you will have a better unit than the factory clutch type carrier.
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CNCFAB
Joined: Apr 2020
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I will 2nd, 3rd, 4th, 5th, and 6th the truetrac and a refresh of all the bearings and what not with a rebuild kit, maybe even used oem gears if needed, which are cheap and plentiful
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Trailering
Joined: Jul 2006
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Thanks all, for the input. The solution does seem feasible to simply (hah, right?) upgrade the current axle with the LS addition. The Eaton with its Torsen drive seems to be the most interesting solution. And, extra points for not having to try to get rid of a non-LSD spare axle unit. Most interesting reading ahead. hanks, again.
Paul
Paul
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