I have posted in several forums what is at stake here:
The first important job in analyzing a JOG (Jumping Out of Gear) condition is to separate the problem into two main root cause possibilities.. (assuming proper shifting techniques are applied)
1) is it shift lever interference or bad assembly..(external)
2) is it an internal transmission issue....
I am including a pic from their parts catalog to better depict how interferences can be existing between the different boot assemblies (4-5), the shifter sled bracket (8) and its position onto the transmission case..(as referred in above post #16) Any issue here will affect full engagement travel, hence setting you up for a JOG condition..
I am also following a similar issue in other forums and know of two cases where the removal of the inner boot and the skid plate above the trans (under the floor control bezel) created successful results. (no JOG)
First indications are that the skid plate (#8 above posted pic) is pushing the inner boot hence creating extra interference with the shift lever. (this might get compounded with inner boot stiffness/durometer in very cold weather)
The Jeeper in the meantime has removed the skid plate and inner boot and has driven for more then two weeks without an issue..
As a more permanent fix, I suggested to him to slot the skid plate mounting holes around the studs and retest.. I will keep you updated.. I have some of his pics and will post them as soon as he gives me permission..