When I use mine, I generally just shut er down to go from 4H to 4L and back again.
I get the same grinding catastrophe as you do.
And 4L really hasn't been used much by me either.
Every once in a while, if I man-handle it, and hammer the t-case shifter as fast as I can, I can get it to move without grinding.
But, after hearing all that mashing a couple times, I just take the safe route and shut off the engine.
Maybe we need to use it more often. [img]/wwwthreads_images/icons/wink.gif[/img]
<font color=blue>edit: I also put the AT in neutral to free up the drive train. Seems to help.</font color=blue>
WD-40 Reverend Grip-Shift
85 Bronco XLT, '69 351W, C6-Shift Kit, 9"-Detroit, Dana 44-Tru Trac, 2" Lift, 33X12.5s