Try this with the machine turned off . Shift your machine from Park to Reverse when you hear/ feel it click into gear where is your shift lever sitting . Is it sitting in the proper spot [slot] or is it in between slots and doesn't line up. Try each gear low ,high and see where the shift lever is actually sitting. The adjustment for the cable that shifts the sub trans is underneath the battery under the hood. Your cable may need adjusting if this is what your having happen. Keep us informed with what you find.