3 speed wiper swap ?????

[70-duster]

I currently have a 2 speed wiper motor in my 70 duster. I have a 3 speed wiper motor and switch out of a 74 dart. What all do I need to do to swap this over into my 70? Do I need to switch out the arm assembly as well? A mouse chewed on the wires for the motor so I will need to rewire the motor, but it still worked. What wiring under the dash do I have to do as well? Thanks.

 

[cudamark]

If you want to convert to 3 speed, you'll need the motor assy with under hood wiring and the switch. The wiper transmission is the same that year.

 

[74Dusted]

The arm that connects to the motor needs to be filed out slightly to fit the 3-Speed Wiper Motor. The slot is slightly smaller for the 2-Speed, but otherwise the same. That was one of the first modifications I did to my '74. I swapped out the 2-Speed & Foot Pump for a 3-Speed & Electric Pump.

Took me maybe 5 minutes with a File to open up the slot on the 2-speed arm enough to fit the 3-Speed motor

 

[cudamark]

Yes, in '74 the wiper link is different between the 2 speed and 3 speed. In '70 it's the same.

 

[74Dusted]

When did they change? Because I had to file out the arm on my '71 Demon to fit a 3-Speed motor as well. The motor came from I believe a '72 or '73 Dart (with a 4-Speed, I think, since the bulkhead plug for the Wiper motor lacks a Neutral Safety Switch connector)

I ran into the same issue with my '74, since my interior harness was from a 4-Speed car and so was the 3-Speed Wiper Motor, It didn't have the connectors for the NSS on the Wiper Bulkhead connector like my original Automatic & 2-Speed Wiper harnesses did.