Swap windshield wiper motor from 2 speed to 3 speed

[dadsbee]

Sorry.. nadda on a switch in my spares!

 

[gkent]

Got 3 spares

 

[Nacho-RT74]

The actual "chrome" rocker IS different between two and three speed - I know this for a fact.

I think the 3-speed switch is the same for all b-bodies 68-70. I know one switch IS different and I think its the headlight switch - which, on Chargers has a part to activate the headlight doors.

Yes, the vacuum system makes a difference, but as far I recall is attached to the switch being not an integral part of the switch? Being posible to separate it. I can be wrong thought.

Dunno, I’m just thinking out loud about this switch. I just have worked on a 70 once. But looking at pictures on web of these switches, I can’t see any difference between 2 and 3 speeds rockers. Just found differences between Rally and standard rocker finish.

 

[devinism]

I can’t see any difference between 2 and 3 speeds rockers

The only difference is that the neck on the 3sp switch is about.020 wider, so the 3sp knob mounting surface is .020 wider also. The knobs from the headlight and 2sp wiper switches are a very tight fit on a 3sp switch. They usually need a touch of filing.
3sp knobs can be swapped onto headlight and 2sp wiper switches (some side play).

The repro knob kits all have knobs that are for the 3sp switch.

 

[RR Fan Dan]

Isnt the linkage different or a piece of it?

Yes the arm is different. I could never find one when I converted my 68, so it went on without wipers, but the $300 3 speed wiper motor looked cool under the hood. You will need a 3 speed switch as well. Those seem easier to find.