Mike, I just wired a hot line off the ignition to the solenoid (that's the driver's side thingy) the device on the pass. side of the tranny is the governor, which I do not use. When I bought my trans. I didn't get any of the kick down switches or wires to the governor. I made the decision to do my shifting manually. On a true, original od system the od automatically 'kicks down' from 'overdrive 2nd gear' to 2nd gear @20 mph. Additionally, say you are cruising along in 3rd od at 65 and you want to pass, the 'kick down' switch is activated when you floor it (located under the accelerator pedal) and will engage 3rd gear for passing.
I have an idiot light wired in-line to remind me NOT to start out in overdrive, the light and the overdrive solenoid are activated by a pull switch in the "T" throttle position on the dash.
You'll also need a pull cable to attach to the OD LOCKOUT. When pulled in the OUT position, this enables you to use your transmission as a regular 3-speed, NO overdrive possible.
When in the IN position the trans. is OD-capable, is freewheeling, (= NO engine braking unless in Overdrive gear). I can actually use my set-up as a 6 speed transmission...1st, 1st od, 2nd, 2nd od, 3rd, 3rd od.
One question none of us asked is what ratio rear end do you have? Mine is a 3.90 which is ideal for this OD, OD= .70, ergo, .70 x 3.90 = 2.73 great for highway cruising @ 65-75 mph which I do frequently. Mind your tire size as well which also affects your final drive ratio.
Hope this helps, takes awhile to get used to, but you will love it when you do. P.S., you WON'T be loaning out your truck unless you pull out the lock out cable and instruct the driver to just "...drive her like a normal 3-speed and don't bother with anything else." The normal 3-speed function is great when hauling a big load of firewood (which I've done) and you need the engine braking and don't plan to travel at high speed. It's just like having 2 transmissions!
