I have a few questions about the wiper motor on my 1962 W100 Power Wagon. My first question is...... Is there a way to control the speed of this motor? Mine seems to be on ludicrous speed. It's outrageous how agressive they wipe. So much so that if I have to leave them on for a 30 minutes in the rain, the wiper blade on the passenger side tears. My second question is................My 1965 W200 had a 2 speed wiper motor. Was this not available in 1962 or is it suppose to be a 2 speed and someone changed it out? My last questions is, are the 1962 and 1965 Wiper Motors interchangeable?