I am having the same issue on my '89. I changed the transfer case fluid and it still feels like it is in 4 wheel drive but the front tires don't spin, the front drive shaft is turning. When I do pull it inot 4 high the front tires spin like it should. The linkage feels goods.
A buddy of mine 99 TJ and his drive shaft is turning while he is in 2wd.
I had almost the same problem.. problem with mine was i would shift it into 4wd the front driveshaft would spin but the tires wouldnt.. So i just tore apart the shift fork on the axle and it was stuck so i just hit it with a hammer and manually shifted it into 4wd. Every scince it worked fine. Check your axles shift fork out see if its stuck inbetween 2wd and 4. Because the 4wd light is just a completed circuit right off the shift fork.
Also make sure all the vaccume lines are hooked up... If so take the vaccume line of that conects to the front axle and shift your jeep in and out of 4wd. Then hook the line back up and see what happens...
This past weekend I took my 4wd acutator off and found that it was stick in the locked position. I just pulled it back by hand and slid the collar over to match the shift fork and the problem was solved. While doing this I broke off a vacumm port on the acutator(rusty). I called local parts dealers to see how much the actuator is and they said about $140. I will fix that by installing the manual system discussed in the other pages. I hope this helps.
Thanks for the advice, guys. It turned out to be another vacuum leak. I got the Jeep out of 4wd by fixing one side of the vacuum harness (for the second time), but then it wouldn't go into 4wd. It turned out that the other line broke while I was fixing the other side. After fixing that side, I now have 4wd and 2wd again.
I think it's definately time for a new vacuum harness, or even better, one of those cable-operated posi-lok gizmos.
1995 Yj 6cyl. Auto all stock landscaping work truck w/add-a-leaf kit - very harsh ride - running a 6.8-foot SnoWay plow.
if you can just replace vacuum hoses , I would go that route for now, posi lok is nice, but its much easier to use the factory set up, if the posi lok isnt adjusted properly it doesnt work properly, can be a pita
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