The Stovebolt Site Forums The Parking Lot '60-'66 Trucks Back up light switch on 61 Apache

My 61 Apache has dealer installed back-up lights. I'm looking for a new switch to install in the bracket on the 4 speed trans. Any suggestions?

The factory-correct reverse light switches, used on the '60-'66 Chevy trucks with the SM420, were rather fragile and not many survived, so a used one may not happen. I see the original reverse light switches, NOS or used, on eBay, from time-to-time. They are not being reproduced, so we use a case-mounted reverse light switch, with the ball-bearing depresser, in lieu of the pin, found on the factory reverse light switch. This switch was used on the '67 & newer SM420 transmissions. The factory switch-mounting tab, on the base of the shift mast, can be modified, to accept the larger diameter neck & jamb nut, found on the newer switch. The connectors on the factory reverse light switch wires (light green & dark green) must be changed to mate with the terminals on the later switch. This fit-up is substantially stonger, more durable and will stand up, to hitting the reverse gate, when shifting.

Many Thanks!! I give that a go!

What does this setup look like?

Thanks

Which one? They both are configured basically the same, but the switch mounting tab is modified, in order to facilitate the the larger switch neck diameter. Also, since the depressor tab, tends to fail at the set screw, that secures it to the shift mast, we use a shaft color, similar to that found on a tie rod adjuster, with a tab welded to it. We have found this configuration to be more substaintial and durable.

Can the newer (67 or newer) top cover be put on an older sm420 to get the backup switch feature? Are they available? I believe mine is a 54.

Thanks

Dennis, no need to swap covers, the backup light & switch was an option that adds on to any trans shifter, see the 57 installation instructions here [pic on 2nd page]

Bill

Hey Bill. Thanks.

I got the do- dad for my 4 speed but liked the screw in method and was fishing to see if the 67+ sm-420 top would interchange into what i got. Then I would see if I could get one in the parts wanted section. If so, then sell my push button set-up.

Thanks again

the 'newer' [68+] is the SM465 - top is different/bigger than the SM420

Bill

Almost any momentary, normally open, push button switch will work. Find one that is the easiest to mount to your situation. It's not necessary to have a "GM" switch. Some modifications may be required. They are easily adjustable. Should be rated at about 5 amps. AC or DC switch OK. if AC, use 50V rated or higher. If DC, 12V or higher.