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jackson · 08-10-2020, 11:49 AM

50 Mercury, stock drive train. BW overdrive. 12 volt with 12 volt solenoid.

When starting out cold, it works as it should.... when I lift the gas pedal, it shifts into overdrive.

After driving for a while.... 20 or so minutes in stop and go traffic, it then will not shift into overdrive.... regardless of speed. It has to sit for several hours before working again.

I do have dual exhaust, and the "added" (drivers side) pipe comes close to the solenoid side of the overdrive unit. Thinking maybe excess heat is causing the problem, I wrapped the exhaust with heat tape, but that doesn't seem to help.

Any ideas ?

08-10-2020, 11:49 AM	#1
jackson Member Join Date: Sep 2010 Location: Lincoln, Nebraska Posts: 54	Won't go into overdrive when hot. 50 Mercury, stock drive train. BW overdrive. 12 volt with 12 volt solenoid. When starting out cold, it works as it should.... when I lift the gas pedal, it shifts into overdrive. After driving for a while.... 20 or so minutes in stop and go traffic, it then will not shift into overdrive.... regardless of speed. It has to sit for several hours before working again. I do have dual exhaust, and the "added" (drivers side) pipe comes close to the solenoid side of the overdrive unit. Thinking maybe excess heat is causing the problem, I wrapped the exhaust with heat tape, but that doesn't seem to help. Any ideas ? __________________ 1950 Mercury mild custom. Original flathead, re-built, bored .040 over, Max-1 cam, Offy heads, Edelbrock super duel with Stromberg 48s.