89 gmc transfer case problem np241-c

wont engauge in any range,no chain slap or nosie at all in transfer. with transmission and transfer in nu.will roll foward not backward.also in 2wd or4wd no drive in any gear or range.also wont go into 4low.

http://www.rsgear.com/products/ep-diagrams/NP_241chevy.asp

Could be mainshaft or problem with shiftforks.

Probably need to pull it apart and inspect it.

//2000CAYukon