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Unread 09-26-2011, 05:00 PM   #1
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Dana 44 Detroit Locker question???

okay im going to try to explain this. i have a 81 CJ7 i took the AMC rear end out of it and upgraded it with a Dana 44 POSI one piece axles. i am trying to figure out what Detroit Locker to get. on the pinion gear its stamped 41/11 so it has 3.73 gears and other numbers as well. stamped after one of the sets of numbers is a 71. so i am guessing it is out of a 71 maybe? is it a 19 or 30 spline. i think that the last year of the 19 spline was 1970 but im not positive?? i have heard different things that i will need to know like inner and out spline counts, would they be the same inner and outer???? drive flanges, shaft diameters??? what do i need to know?? thanks, jeff

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Unread 09-26-2011, 05:14 PM   #2
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the gear ratio break for Dana 44 diffs is 3.73 and down and 3.92 and up. If the ring gear is stamped 41-11 then you have you have 3.73 gears and you need the 3.73 and down diff case/locker. If the rearend has flanged one piece axles it is likely 30 spline but you can make a positive spline count by looking at the spline end of the diff side gears.
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Unread 09-26-2011, 05:22 PM   #3
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okay i will count them next time im home. those would be the spline you can see on the inner of the spider gears? if it turns out to be the 19 spline then would it even be worth it to build it up or just get a 30 spline?
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Unread 09-26-2011, 05:40 PM   #4
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Yes, the splines in the spider (side) gears. If you have a Dana 44 with 1 piece axles, it should be a 30 spline. If it is 19 spline, then it would probably be 2 piece axles in which case you'd probably be better off upgrading your old AMC 20 with Superior or Moser 1 piece axles.
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Unread 09-26-2011, 05:44 PM   #5
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okay thanks alot
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Unread 09-26-2011, 06:01 PM   #6
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sorry one more question, what kinda job is it to put in a Detroit Locker? is it an somewhat easy job or will i have to shim things or need a press? thanks
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Unread 09-26-2011, 06:14 PM   #7
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It might be an easy job for someone thats done it many times in the past. Most people would pay to have it done. It will involve both shimming and needing a press and a few measuring tools that you may not have. The posi carrier gets removed and the locker gets installed in its place.
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Unread 09-26-2011, 06:20 PM   #8
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Quote:
Originally Posted by frankush View Post
It might be an easy job for someone thats done it many times in the past. Most people would pay to have it done. It will involve both shimming and needing a press and a few measuring tools that you may not have. The posi carrier gets removed and the locker gets installed in its place.
Yeah, like he says. The biggest PIA is the fact that the Dana 44 shims are under the bearing cones so everytime you want to make an adjustment, the bearings need to be removed then replaced.
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Unread 09-26-2011, 08:19 PM   #9
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Putting in a Detroit locker is just like putting in an open carrier. You have to setup the gears if you change gears in a particular housing.

That said, I have been able to swap an open carrier for an Eaton E-locker carrier by just moving the ring from the old carrier to the new one and use the exact same setup shims which were there before. I did this once and had the same backlash for both carriers. I don't know how common this is likely to be but carriers are precision made so I expect this is not unusual. If you are changing the gear set in your axle housing you will have to setup the gears no matter what carrier you use. (detroit, open carrier, tru-trac, etc)
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Unread 09-26-2011, 08:55 PM   #10
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I've done several posi/locker installations and what you need to do is take the backlash around 3 points of the ring gear on the existing diff before you loosen up the diff cap bolts. Make a note of the backlash readings and set the new locker/LS to an average of the 3 readings.
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Unread 09-27-2011, 04:41 AM   #11
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Okay thanks a lot guys. I counted them last night and they are a 30 spline going into the side spiders. But in the process of taking the diff cover off, in the back there was what looked like a small metal clip about the size of a fingernail M shaped. Is this bad? Also what it looked to be little metal shavings, is this from the clutches and on guessing this is very bad???
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Unread 09-27-2011, 10:34 AM   #12
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Without any pics, I can only guess that you have a Trac Lok and the metal clip you found is the retainer clip for the clutch discs. Post a pic if you can. Fine metal particles in the oil is not unusual especially for rearend with a limited slip. Larger pieces of metal is definitely not good. If the clip was floating around in there, it could have gotten caught between gear teeth and done some damage. How does everything else look? Grab the pinion and try shaking it up and down/in and out. If you feel play, it's time for new bearings. If there is no play, feel if it turns smoothly with no roughness.
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Unread 09-27-2011, 12:57 PM   #13
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My phone won't let me upload pictures but the pinion gear is nice and smooth. I went through the fluid in the pan and there was only one piece of metal really small but still noticeable while sifting through the gear lube. Everything else looks really clean n no visual chips. I think I'm just Gunna get the parts and bring it to a 4x4 shop I work with a lot. Thanks for the help guys
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Unread 09-27-2011, 08:44 PM   #14
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Jeff, if you want to text me the pictures I should be able to upload them for you.
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Unread 09-27-2011, 09:02 PM   #15
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The end of a Dana 44 Trac-Lok clutch clip guide looks like an M if it breaks off the clip guide. Here is a picture of a clip guide from the side.
http://broncograveyard.com/bronco/i-...lip-guide.html
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