55 second series 3 speed overdrive questions
I am usually on the 67-72 side and have redone a 71 GMC custom swb step and 72 cheyenne swb step. I have a 55 big window that ive owned for 30 yrs (!) that i need to get going again. Back in the eighties my brother installed an overdrive that if i remember correctly came out of a 58/59. Unfortunately the donor truck didnt have any of the wiring or controls. My truck is all original but needs a full restoration. I found a wiring harness from Jim Carter but does anyone have any more info about getting the overdrive working correctly?
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