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The 249 has a viscus coupling that allows slipage for full time 4x4. When the coupling fails it starts to lock up but normally it fails slowly over time. The coupling is expensive to replace and hard to get. I replaced the whole t-case with a rebuilt unit fron Transfer Cases Unlimited (George, 631-226-1448) and it works great.

You can also get a 242 made with some 249 parts that will bolt into the Cherokees also. TCU makes these units and a large group of GC owners did a group buy with George last year. If you want some testimonials on George go to the older Grand Cherokee forums at and search for Transfer Cases Unlimited

80 CJ/YJ-7 FrankenJeep
89 YJ
94 Grand Cherokee
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