so i am having issues getting the shifter to lock in for 2wd. it just like pops back to 4wd part time. i have a 242 does anyone know how to adjust something to make it work???

 

Here's how the factory suggests you shift the transfer case and I've been doing this since these things were new and I worked at the dealership. Quoted from the owner's manual.

"To engage, shift the transfer case lever from 2H to 4H while the vehicle is moving at any legal speed". I let off the gas, throw the lever, and then tap the gas and let off.

4L position: " To engage, slow the vehicle to 2-3 MPH , shift the transmission to Neutral, then shift the transfer lever to the right and pull firmly rearward to 4L".

Transfer Case Linkage Adjustment
Straight from the FSM:

SHIFT LINKAGE ADJUSTMENT
(1) Shift transfer case into 4L position. (make sure your shifter is fully in the 4L position)
(2) Raise vehicle.
(3) Loosen lock bolt on adjusting trunnion (Fig.
87).
(4) Be sure linkage rod slides freely in trunnion.
Clean rod and apply spray lube if necessary.
(5) Verify that transfer case range lever is fully
engaged in 4L position. (you can do this under the vehicle at the transfer case)
(6) Tighten adjusting trunnion lock bolt.
(7) Lower vehicle

 

Just do your shifting while moving. I had the same issues with mine until I figured this out. I can shift into 4x4 while still but if I try to shift back into 4x2 while still it will take me driving till about 15 mph for it to disengage.

EDIT: I have an XJ with a 242, and one with a 231, and both do the same thing.