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Transmissions and Rear Ends Three on the tree or four in the floor? Shift it all here.

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Old April 7th, 2020, 03:26 AM
mobrien699 mobrien699 is offline
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Default SM420 Reverse (Backup) Light Switch

What’s the best part of being quarantined at home?! ...finally having time to rebuild my SM420! My ‘66 Suburban has reverse lights; however, the factory reverse switch is missing and it seems to be just about impossible to source. Question to the group, has anyone successfully replicated the factory reverse switch using components that are readily available? I would love for my reverse lights to be operational without using a toggle switch!

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Old April 7th, 2020, 04:02 AM
tbucketnut tbucketnut is offline
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Default Re: SM420 Reverse (Backup) Light Switch

Hello, the best way around this problem is to scour the bone yards and ebay looking for a top cover from a 1967 Sm420. It has a factory backup switch incorporated in it, not the cheasy dealer add on that found their way into many 60-66 Chev/GMCs. Unfortunately the 1967 sm420 was the last year put into trucks so it will be a rare find but they're out there. I came across one last year that will be going into my 64. Slow load on the picture but worth the wait.
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File Type: jpg IMG_2394.JPG (3.63 MB, Multiple views, 19 clicks)
Steve Stock
Gig Harbor, Wa

1953 Chevrolet 3100
261 cu inch, SM420
Finished Cab off restoration

1964 GMC 1000
305 V6, SM 420
Restoration is now started
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Old April 8th, 2020, 11:19 AM
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AZKen AZKen is offline
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Default Re: SM420 Reverse (Backup) Light Switch

I have thought about it over the years because the originals are hens teeth. It really would not be too difficult.

In general:
1. One momentary N/O push button switch.
2. Bracket for switch, welded to shifter retainer cup.
3. Actuator made from a set screw shaft collar with a paddle/lever welded to it.
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Last edited by AZKen; April 8th, 2020 at 09:32 PM.
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