My gq did that it was it sincro in the transfer for 4x4 to engadge I think some1 was very hard on it b4 I bought it can you keep it in gear by holding the gear stick or does it just drive it straight out again
Maybe the prevoius was real hard on the changes 4l -4h and vice versa, I think there must be some damage in the transfer.
my ol mq that had done a zillion kays use to jump out of 4th, id just jam a pillow in to keep her in when travelling! Sorry you just jogged my memory.
How many kays has it done? and how long have you had it, changed oils recently?
the boot on the trans shifter is pushed down the lever to far this stops the lever locking in to the lock out ,and there are no syncos in the transfer case and syncos do not make a gearbox jump out of gear