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1985 Silverado that I am trying to “UN-F**k” what the previous owners did they the years. I had my 700R4 rebuilt recently but the repair shop left the B&M converter lockup attached. I want it back to original. How do I accomplish that and is this module on the firewall related in any way? The yellow wire from the B&M box ties into the blue wire. Thanks.
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Not sure how B&M did their lockup mod,but that vacuum switch is how early 700's lockup was controlled.vacuum line should go to manifold and I believe there will be an inline delay on the vacuum line.Wiring went also thru stop light switch.
 
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