Single Track to a Posi??
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Joined: Oct 2004
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From: Winnipeg, Manitoba
You'll need a 9inch carrier that was originally set up as a posi-trac. Either buy new(very expensive) or find a good used one, and have it checked out by a transmission shop to make sure it's operational. If you don't mind spending a few extra bucks, check into an ARB locker. This is a great part time system, that can be left as an open differential for daily driving, and with the flick of a switch, be fully locked for when you're stuck, or want to drag race down a straight road.
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Joined: Oct 2004
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From: Winnipeg, Manitoba
http://www.mustangandfords.com/techarticles/16399/
Here's one article in regards to the 9 inch rear ends, I'm referring to the center section(sometimes called the 3rd member, or carrier) This is the part that holds the gears, and posi-trac clutch packs. If you end up searching through wrecking yards, look for a big N stamped onto the member, as that would indicate is is a posi-trac unit. Click on the 4th pic from the top on that link, and it will show you where the N is on the housing. That will be your biggest clue in finding one in a junk yard.
Here's one article in regards to the 9 inch rear ends, I'm referring to the center section(sometimes called the 3rd member, or carrier) This is the part that holds the gears, and posi-trac clutch packs. If you end up searching through wrecking yards, look for a big N stamped onto the member, as that would indicate is is a posi-trac unit. Click on the 4th pic from the top on that link, and it will show you where the N is on the housing. That will be your biggest clue in finding one in a junk yard.
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Joined: Oct 2004
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From: Winnipeg, Manitoba
Originally Posted by fordfan302
so finding a complete center section like that means i can just unbolt my center section, remove it, and then blot in the new one?????? is it that easy??
If you find one, have a transmission shop check it over. Likely, if it's been sitting for a while, it will have deteriorated clutch packs inside, and may only operate as an opened diff. Once you know that everything is going to function properly, you have to remove your rear wheels, brake drums, and the four bolts that hold your axles in, pull the axles out, then drop the existing carrier. The trick here, though, is to make sure your axles will fit, as Ford used several different spline counts, and lengths of axles on various different vehicals. It might be best to grab the whole rear end, and have everything available. At the very least, try and grab one from a truck, and the axles as well. If you find one in a car, you'll likely have to get it reworked a bit so that your existing axles can be used with it, if the spline count is not the same.
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More Turbo
Joined: Nov 2004
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From: Cleveland, TN
well i figured you would have to pull the axels.....but wont the tag on the diff. cover tell you the spline count???
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More Turbo
Joined: Nov 2004
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From: Cleveland, TN
and another thing.....i will probably buy the center section off of ebay and most of the auctions i look at tell the spline count......so i guess if i knew what mine were then i wouldnt have to worry about that
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Elder User
Joined: Oct 2004
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From: Winnipeg, Manitoba
Not necissarily. I've always had to count the splines on mine when doing any type of upgrade. When I still had my beloved 69 F100 4x4, I lucked out and found another truck of similar year that had(likely wasn't original to the parts truck) a rebuilt N case rear-end in it, with the same gearing as my 69. It was also a 31 spline axle set-up, where my original diff was only a 28 spline.
Elder User
Joined: Oct 2004
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From: Winnipeg, Manitoba
Originally Posted by fordfan302
so the best thing to do would be to pull of a wheel and brake assembly and yank an axel and count the number of splines
Yup. I would personally. At least you'll know what you have, and what you're going to want to look for.
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From: Kalispell, MT
RR4E...approximately what does an ARB locker unit cost? and does that come with the entire housing, axles and everything? or??? that sounds like it would almost be the best way to go...any information would be helpful...thanks...
MontanaFord
MontanaFord
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From: Winnipeg, Manitoba
http://www.rocky-road.com/airlocker.html
http://www.arb.com.au/
Both explain the ARB better than I can. Essentially, it's a kit you add to your existing differential, complete with onboard air compressor under the hood (good for airing up flats as well) that gives you the option to lock and unlock at will, gaining the benefits of a fully locked differential like the Detroit Locker, and still retain the benefits of an opened differential for every day driving.
http://www.arb.com.au/
Both explain the ARB better than I can. Essentially, it's a kit you add to your existing differential, complete with onboard air compressor under the hood (good for airing up flats as well) that gives you the option to lock and unlock at will, gaining the benefits of a fully locked differential like the Detroit Locker, and still retain the benefits of an opened differential for every day driving.
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Joined: Apr 2004
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From: Ocala, Florida
You could also look at the Detroil Electrac, it is operated electronically instead of an air system. The unit operates as a limited slip and when you want it to function as a locker you just flip the switch and it will lock. Both the ARB and Detroit units are good solid units, and both are expensive.