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Old 03-18-2011, 01:23 PM   #10
Tom Endy
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Join Date: May 2010
Location: Southern California
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Default Re: Borg Warner R10 overdrive conversion for Model A?

Mitch & Rich of bakersfield, CA who build the Volvo overdrive mod for a Model A came up with a device to prevent backing up with the overdrive solenoid engaged. It works as well for the Borg Warner.

They install a cut out switch in a hole drilled into the end of the tunnel knob on the transmission tower (passenger side). When shifting into reverse the shifting shaft enters this tunnel and opens a normally closed switch that removes power from the solenoid.

The angle placement of the switch is critical. Straight back it interferes with the cross member. Too high and the switch will not activate.

Tom Endy
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