AW4 Transmission shift problem

Hi there... I have an '87 Cherokee with an AW4 transm. on it and this is what happens.

P....... ok

R....... ok

N....... ok

(D)..... No overdrive, it tries to engage but it loses it

3....... Only two gears (it's supoused to be 3 right?)

1-2.... Only one gear (it's supoused to be 2 right?

Any ideas? I'm going worried , she is good I don't wanna lose it.
Thanks in advance

any vac. leaks?

Hi there... I have an '87 Cherokee with an AW4 transm. on it and this is what happens.
P....... ok
R....... ok
N....... ok
(D)..... No overdrive, it tries to engage but it loses it
3....... Only two gears (it's supoused to be 3 right?)
1-2.... Only one gear (it's supoused to be 2 right?
Any ideas? I'm going worried , she is good I don't wanna lose it.
Thanks in advance
Maybe your shift linkage is out of adjustment. Did you do a lift? Is you transfer case droppped?

Next issue...did you rebuild the NSS?

Maybe your shift linkage is out of adjustment. Did you do a lift? Is you transfer case droppped?

Next issue...did you rebuild the NSS?

Thanks alohabra, one thing please.What is the NSS and where is it located.How do I rebuild it?
Tip,,,,Mine is an '87 cherokee pioneer 6L 4wD 4.0 .Also I resenctly changed the motor mounts and transm. mount, may be that I messed something out. The linkage aligment,,, how to do it?

any vac. leaks?

Vacum leaks? Where?

I know there should be a vac going into the transfer case. not sure if your tear had it.

any vac. leaks?

vac leak...Where?