2 Weeks ago, serviced the Auto Trans in my XH2 Van, 210ks on clock. today gearbox changes roughly lost 4th, and downshifts under brakes like a late model BMW. Im about to check the fluid level right now.... Any suggestions... Help....

Wow.. All day stuffing around, and finally put it on computer to find throttle angle sensor, playing up. $55 for a new throttle body, including sensor. Problem solved. Nothing wrong with gearbox at all, just a symtom of the disease. Anyone come across this before ?