ive got an 86 trooper 2. wheels great, except sometimes, most of the time, my 4wd pops out into neutral. alot mainly when im going up hills. whats the problem?

 

TWO THINGS CAN CAUSE THIS PROBLEM, FIRST IS THE TIRES NOT BEIGN THE SAME ROLLING CIRCUMFERENCE , , OR THE MOST COMMON IS THE HOLD BACK SPRING ON THE 4WD SHIFT LEVER , PULL THE BOOT UP AND TAKE A LOK RIGHT WHERE THE SHIFTER COMES HRU THE FLOOR THERE SHOULD BE S PRIN GOING AROUND THE SHIFT LEVER OVER TO A BRACKET ON THE MAIN SHIFT TOWER , IF THIS SPRING IS BROKEN OR MISSING IT WILL NOT STAY IN 4WD , ONE EASY TEST IS , CAN YOU HOLD THE LEVER IN 4WD WITH JUST A SLIGHT BIT OF PRESS URE , IF SO CHECK THE SPRING, , JERRY < =""><!
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well my tires are all the same size and my friend tried holding it in and he couldnt. it still popped out on him.