3 speed saginaw with overdrive

[curvedglass]

my bad - I bought a non-synchro 319. I also have a three on the tree with the 230. It came with the engage cable that goes to the lever on the OD section of the trans. I also got a wiring harness with it but it is old and brittle. Part of that harness has a switch that should mount to the firewall and it gets 'kicked down' by the throttle linkage when you floor it. This disengages the OD. I do not have the brackets for the switch and some guys have posted about a second high beam switch or guys with floor shifters mount a momentary switch. And then one guy posted he doesn't even use the switch as the trans downshifts when the truck drops below 23mph - although that works for slowing down - not changing lanes. My previous owner set the truck up with 3.08's and I want to go back to 3.73 for normal driving and then I have the OD for highway.

First it would be cool to see how much I can eek out of the 3.08's and OD for few tank fulls.

I was wondering how you had your wiring hooked up. Picks of your switch set up etc would be key.

Thanks in advance for the info.