Found this harness in my stash of parts. The wiring is a bit rough but it was labeled "4 speed". The relay is p/n 3961573 which shows up as TCS relay for 1971 V8 manual cars in a couple of Buick resources (gm parts book circa late 1971 and also late 1976). Ok, thats fine but I can only find one wiring illustration and it doesn't look quite like this one. Anyway, can somebody ID this harness? Never had a 4 speed...(harness will be for sale too). Thanks
