1986 Jeep CJ7

Transmission problem
1986 Jeep CJ7 6 cyl Four Wheel Drive Manual 135000 miles

I am trying to diagnos a issue with my jeep. I have never had any trans or axle trouble, and now when I put the jeep into gear, I do not get any traction. The drive shaft spins and when the truck is on jacks the tires will spin; but on the ground I can not go forward or back? When I lock the hubs abd try 4x4 it can not pull itself. Any suggestions, before I tear down the rear-end?
January 23, 2008.

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