is it possible to put a 3 speed wiper motor in where there is a 2 speed whats the proscess? i have3 speed switch this is for a 69 roadrunner .2. if it is a really big deal can i install 3 speed wiper motor and run 2 speeds i like the low profile of the 3 speed.

I ran the 3-speed wiper off the 2-speed switch in my '69 RR. I now have the 3-speed switch. Likely there are some wiring changes. Nothing a shop manual won't reveal!

Yep, it's possible as I did the same thing. My RR originally had a 2 speed but I wanted a 3 speed to run the N96 air cleaner stuff. I found a decent working 3 speed motor and wired it up. IIRC, I didnt have to wire anything differently in the harness itself. I believe it was pretty much "plug and play." I believe that the is a linkage arm that is different however, which needs to be used with the 3 speed. The 2 speed will work, but I had erratic issues when I had the 2 speed switch. Once I switched over to a good 3 speed switch, things work as they should.