'78-'84 wiper motors are the same. '85 and later use a remote washer pump (better, IMHO) but either style wiper motor can be used with the '84-up wiper switch.
Good to hear. I've looked up the part and they LOOKED the same except for the lack of washer pump, but I didn't know if they might be different somehow electrically.
I agree completely on the remote pump. The stockers are nothing but aggravation both in use and reliability. An electric universal pump will be used from the get-go on this.
You may only need to change the arm on the wiper motor. I am currently running a 78 wiper motor in an 86 cab. I have a universal washer pump mounted on the firewall below it with the wires connected to the wires for the washer pump on the stock motor.
Good to know, but assuming the motor will work with the newer column-mounted wiper controls and delay module, I should be good. The motor, linkage, and cab all match ('78).
I haven't done any wiring yet, but a couple things I have had to deal with so far for this swap:
-the newer column came with a backup light switch, but there are no separate neutral safety switch terminals like they used on the '78. I just swapped the switch from my old column.
-the newer column did not come with the gear indicator cable and bracket and has no provisions for one. The one from the '78 would not work as-is even if I cut a slot in the shift collar because the back of it hit the larger plastic wire conduit at about the neutral position. In order to use the old cable assembly, I had to cut the little arm off the screw bracket and weld it on the other side so the bracket is as far away from the conduit as possible. This was fun with a stick welder, but it gave me just enough clearance for full shift range. I then cut a slot in the collar as the original '78 column had for mounting. I'm sure that's clear as mud, but I'll post some pics when I get them uploaded if anyone's interested. I would like to know how the later gear indicators worked though...
-the ignition switch is also different. The connectors are compatible, but the switch on the newer column was somewhat worn so I swapped the actual switch components with those from the '78 column (which was like new). The basic components are the same; only the bracket is different between the two. My advice: buy a new one. I got the job done, but assembling an ignition switch is like putting Humpty-Dumpty back together except in this case, he's greased and spring loaded.
I can probably get the wiper motor and linkage from the truck the column came out of, but of course the cowl was changed - will the later linkage work in the earlier cab cowl?
