2003 Jeep Cherokee problems unlocking the differential

2003 JEEP CHEROKEE
60,000 MILES • 4 CYL • 4WD • AUTOMATIC
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JMAGANABUSUTIL
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My car is equiped with Select-Tract transfer case and trac-lok rear axle.
When I engage any option of 4x4, the diferential remain totaly bloqued, and the rear weel cannot rotate at diferent speend, sliding on the asphalt.
When I turn back to 2-whell, still the rear whell remain with the diferential bloqued. Only after many km driving, the diferential works better but not perfct.
Sep 6, 2009 at 1:36 PM
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RACEFAN966
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Ok so if I understand right your front is running at a different speed then the rear? I have to ask a few questions ok. Any new tires on this Jeep? Has there been any diff work on it? Have you checked to see if the front and the rear are the same ratio? Get back to me with what you can.
Sep 8, 2009 at 10:06 AM
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JMAGANABUSUTIL
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All tires are identical. The problem is easy to observ by someone outside the car, and making a slow U-Turn. If you do that, you see the interior wheel trying to move at the same speed that the exterior one. And, obviously they cannot, and slid on the asphalt loudly.

regards
Sep 8, 2009 at 12:31 PM
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JMAGANABUSUTIL
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Sorry, I forgot to say that all this only appen on rear whels
Sep 8, 2009 at 1:01 PM
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RACEFAN966
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Ok if you would mark all 4 tires and then roll the car straight for one rev. of the tires and see if any of the tires are not rolling the same distance. If a tire is really low it won't roll the same distance either. See the rear can't lock that way as the rear end is a limited slip rear diff. Meaning that it has clutches. Now if the rear end fluid was changed and the limited slip additive was not added then that could be a problem. Any way check the rolling distance first and let me know how that goes.
Sep 9, 2009 at 10:04 AM