I've been having a problem with my automatic transmission when climbing rocks. The shift lever physically shifts from drive to neutral. I just swapped out the lever because the original's OD button was messed up. The linkages looked fine. The transmission fluid level is also within specs. It also shudders really bad when putting it in gear. The transmission drives and shifts fine on the highway and down the trail, its just when I stress it trying to climb rocks. What am I overlooking? Thanks for the input!