I have a 92 parts truck that I am using pieces off of for my 73 diesel build. This 92 truck has cruise control, does anyone know if its a separate system where I can pull the underhood module/linkage and the controller and hook it up to the VSS on the 47RH transmission and get it to work or it it hooked in with the PCM and needs motor signals and all that?

I would consider an older unit, but the 47RH transmission i am using already has the VSS and I have never seen a working older cable driven cruise control.

Isn't the 92 diesel donor a cable operated cruise?

My 92 donor is a gasser, but pretty sure they were still electronic. The diesel I am swapping is actually a 4bt out of a bread truck. That has been its own set of headaches as far as controls are concerned. Used a 94 throttle cable bracket fabricated to fit onto the shorter 4bt pump. Now onto the electronics side of it.

Finally found some readable wiring diagrams. The cruise control goes through the PCM, no other modules. So, I guess I just have to figure out what the PCM can live without and still allow me to use the cruise. Hopefully it doesn't need a crank sensor, everything else I pretty much have already.

If your donor is a gasser, the cruise will be actuated by the ECM. You would be leaps and bounds better off finding a cruise unit from a carbed car or truck and using that. I don't think your 92 ECM will operate the cruise if it doesn't think the engine is running, and that will be tough to fake without a distributor input! There are also aftermaket cruise control systems, however they are a little more spendy than junkyarding stuff.

In my research yesterday, that is pretty much what I figured out.
The factory ECM pretty much needs to see a running motor, including moving throttle position to get the cruise to work.

I already have a TPS sensor to work with my Compushift transmission controller, and the Dodge VSS for that as well. The compushift has an output for an electronic speedometer so I am contacting them to see if its possible to use that for an aftermarket or stand alone GM cruise control module.

wasnt there a primitive add on cruise chrysler used that ran off the speedo cable had 3 wires and had clip on button that fit the end of the turn signal switch? seems they were put on some motor homes too...

That wasn't primitive . . . that was factory for mopar !!! Way easy to swap into virtually any rig, so long as you get speedo cable to the transducer, and then out of transducer to speedo head. Wiring is simple, you need to get the brake switch from a car with this, as it has another contact in it for the cruise control. Other issue would be the bracket to hold the cable from the cruise control, and the "lost motion" link that fit onto the carburetor . . . . but you could probably figure all that out easier than the "electronics" . . . .

You might find everything you need on a 5th avenue . . . other than the speedo head cable that is . . . The cruise had it's own wire harness that you can take without cutting anything . . . again, get the brake switch, take the cable from the tranny to the transducer, and perhaps the transducer to speedo head . . . and everything else (switch on column, etc) . . .

For what the current aftermarket cruise controls sell for, I'm not sure I'd want to walk through a Pick A Part looking for a 5th Ave to hijack the cruise off of. My luck is I would get one that didn't work.

The next thing that will screw you is a lot of the 91+ have clocksprings in the steering column and the cruise control switches are in the steering wheel. There is not an easy way around the clockspring.

I have a 91 Dakota here that I'm stripping out that has cruise, and a 90 I would love to add the cruise to, but the 91 has the clockspring and the switches on the wheel. I have to buy aftermarket switches, and they are pretty proud of those. Worst part is I don't know if the aftermarket switches are compatible with the Mopar cruise. Its never easy...Gene

Here is what I have decided to try. Take the standalone GM electronic cruise control module

http://www.ebay.com/itm/like/232254239908?lpid=82&chn=ps&ul_noapp=true

Which accepts a pulse signal (I think ideally its 2000 pulses per mile or 4000 ppm with the amplifier) and hook it up to the speedometer output on my transmission controller. The controller can adjust the ratio of pulses coming from the VSS so I should be able to tune it until the accelerate switch gets me approximately +1 mph, etc. This is all in theory, but its what I am going to try as it doesn't add another adapter to the mix nor does it mean using the factory ECM and the added sensors and wiring that takes. If that doesn't work I may try getting the factory ECM to work or a cable speedo to an adapter with VSS for the controller.

Now, I will update this when I try it, probably a month or two. Posts where someone comes up with something and never replies back to say it works or not are the worst thing ever on a message board, in researching this on the internet I came across several such dead ends.