Four wheel drive

#1

I have a Dodge Ram 1500 1997. My problem is four wheel drive on the truck and some one told me something about Rube Goldberg Vacuum servo/Switch set-up. What is that and where is it located at?

#2

My 84 GMC S-15 had a vacuum actuated 4wd system (made by chryco). I wonder if it might be the same thing. The vacuum actuator was located in the engine compartment on the fender well.

#3

Many trucks have servo switches, but Dodge uses the Rube Goldberg servo system. Under the dash, the button moves a switch, that drops a ball, that travels down a ramp to a bucket. The ball falls in the bucket, which tetters another lever that spins a fan. The wind creates a vacuum that actuates the 4WD servo, and kicks in 4WH.

Rube Goldberg was truly a master:
http://dashboards.tv/images/rube-goldberg.jpg

Another Rube Goldberg inspired treat: