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Check the transfer case and the wheel hubs. Use any noises the Jeep makes to locate your problem. Keep playing with it, most likely the t-case is out of alignment with the tranny. 87 Cherokees don't have locking hubs. A good place to look is the vacuum-diconnect on the front axle near the passenger side wheel. There will be several(plastic) vacuum lines connected to it that often break/split (especially with a 19 yr old vehicle) that also connect to the back of the transfer case. I don't remember exactly how to check it, but I think even the Haynes manual tells you how. If it is the prob and you use 4wd often, consider an aftermarket mechanical disconnect system or make your own like on this page:(

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โˆ™ 2006-10-09 00:38:29
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Q: What should be checked if a 1987 Jeep straight six will not shift into 4 wheel drive?
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