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Posted By: old dog back up - Tue Nov 24 2009 04:00 PM
did they ever have back up lights on a 61 gmc with a 4 speed trans .if so how was it hooked up ,if not how can they be hooked up ?thanks
Posted By: squeeze Re: back up - Tue Nov 24 2009 04:15 PM
first item here - mechanically actuated by the shifter

Bill
Posted By: MarvelMysteryEar Re: back up - Tue Nov 24 2009 08:11 PM
Incorrect Bill. That is not a switch for a 4 speed.

Here is the original GM mechanical back up light switch that mounts on the 4 speed shifter.

http://members.cox.net/images4755/scan0001.jpg

http://members.cox.net/images4755/Img_4379.jpg
Posted By: old dog Re: back up - Wed Nov 25 2009 03:24 PM
that had me stumped ,and now this clears the fog away from my brain !i wonder if this is still available with the harness ?
Posted By: LGriffin Re: back up - Thu Nov 26 2009 03:56 AM
I've heard reports that the 67 SM420 had a reverse switch, or are the links "Mother Trucker" switch it?

Larry
Posted By: MarvelMysteryEar Re: back up - Thu Nov 26 2009 05:25 AM
That GM backup light switch posted by M.T. will work on any SM 420 4 speed from 1947 to 1967.
http://www.novak-adapt.com/catalog/sm420_parts.htm

We just thought it was important to dispel the mis-information posted on this subject earlier. dang
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