Re: Help!! Transmission Wiring Harness!!
The two wires that you circled are for the backup lights on a floor shift four speed manual transmission, (light green and dark green wires).
If your TH 350 has a wire connected to it, (one wire) then it was part of an emissions system that was mentioned in a previous post.
Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end
1965 Impala SS 400 sbc, Muncie rock crusher
1966 Impala SS 396 bbc, TH 400
1969 El Camino, 350 sbc, TH 350
1971 Snowplow built on a Blazer frame
1972 GMC Short bed, stepside, TH 400, 427 BBC
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