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Old 10-03-2011, 08:09 PM   #1
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Trac Loc

How do I know if my Jeep was equipped from the factory? I know how to check if it is working.

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Old 10-03-2011, 09:43 PM   #2
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the sure method is pull the diff cover off and look.

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Old 10-03-2011, 09:53 PM   #3
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Jack it up by the diff...in neutral, spin a wheel. If the other spins opposite, you have an open diff. If it spins the same direction... You have a trac-loc or some type of posi unit. Only way to truly know what it is is to open that pig up.
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Old 10-04-2011, 01:14 AM   #4
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Grab a build sheet from a dealer or compnine if you know the rear axle is completely stock.
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Old 10-04-2011, 01:41 AM   #5
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Jack it up by the diff...in neutral, spin a wheel. If the other spins opposite, you have an open diff. If it spins the same direction... You have a trac-loc or some type of posi unit. Only way to truly know what it is is to open that pig up.
Actualy, you leave it in gear so the driveline doesnt turn, if the opposite side turns in the opposite direction, its open.
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Old 10-04-2011, 05:08 AM   #6
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Grab a build sheet from a dealer or compnine if you know the rear axle is completely stock.
This... You can take it to a Jeep Dealer and they will run the VIN for you and tell what was stock on your Jeep You can e-mail Jeep for a build sheet also... But checking out CompNine will be fastest!
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Old 10-04-2011, 07:04 AM   #7
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+1 on CompNine...it may not be perfect like a build sheet, but I found it very useful when deciding on which Jeep to buy.
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Old 10-04-2011, 07:50 AM   #8
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CompNine just shows basic info on the vehicle.
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Old 10-04-2011, 07:51 AM   #9
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Ooops. Likes like you need to pay a fee.
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Old 10-04-2011, 07:52 AM   #10
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If anyone has the service, would they mind checking for me? I have no need to sign-up for a subscription.
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Old 10-04-2011, 08:00 AM   #11
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Ok....juts found out that I have a Dana 35 with NO trac loc on this one. Too bad. Besides pulling the differential completely and replacing, is there anyway to turn a Dana 35 into a Trac Loc?
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Old 10-04-2011, 12:01 PM   #12
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If you just want a cheap way to lock it I guess you could pull pull the diff cover and weld the spider gears together so they cant turn, its a popular method of making a spool, cost you 2 bottles of 75-90 gear oil, thats about as cheap as you can go.
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Old 10-04-2011, 12:04 PM   #13
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Hmm..I can check on Compnine for free...and it will tell you build sheet info.

If you PM me your VIN, I can run it and send back the info..
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Old 10-04-2011, 09:50 PM   #14
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That would be cool! I will do that.
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Old 10-04-2011, 09:53 PM   #15
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That would be cool! I will do that.
If you plan of driving the jeep on asphalt, don't weld your gears, especially with a Dana 35. Its not worth blowing up your axle.
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Old 10-05-2011, 01:40 AM   #16
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Yes, sorry, I had intended to add that its s bad idea, cheap, but forces damage to the shafts, even if only run on dirt, I have s friend with s welded sami, works well for a few months to a year.
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Old 08-29-2012, 07:15 AM   #17
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I am new to the forum, but this is my 4th wrangler in my lifetime.. I have ran into several unexpected problems, soon after I bought it, and you have been on almost every thread with, what to me is the best information, and that sounds the most common sense.. I was hoping you wouldnt mind me asking you some dumb questions now and then.. Im a novice DIYer... and again, thanks for your knowledge and common sense... I dont know why some people write some of the things you do after you have.... Have a great day Pete from AZ...
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Old 08-29-2012, 05:04 PM   #18
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Actualy, you leave it in gear so the driveline doesnt turn, if the opposite side turns in the opposite direction, its open.

This is not correct, or at a minimum misleading. If you were to put the vehicle in gear (or in some other fashion render the driveshaft unable to move) and turn one wheel, the only possible result is that the other tire would spin in the opposite direction. Now, if you had a functioning trac loc differential, turning the tire in itself would actually be quite hard due to the fact that you would be fighting the LSD clutch packs in order to make this happen.

Thinking about it for a moment now, that would acutually be a half way decent method of determining how much the clutch packs are still functioning.

Anyone ever done this? I would think that the most accurate way of doing this test would be to keep one wheel on the ground to keep it from spinning, and then use a torque wrench and see how many foot/lbs it took to spin the opposite tire (the tranny would need to be in neutral).

A factory trac loc new has clutch packs rated somewhere in the 60-70 pound range i think? Don't quote me on that, I'm not at all certain.

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