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Mod | | | Forums66 Topics126,776 Posts1,039,271 Members48,100 | | Most Online2,175
Jul 21st, 2025 | | | | Joined: Nov 2005 Posts: 188 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 188 | Has there ever been a Back up light swich for sm420 4 speed? Asking for my 58 Viking 60. Thanks for any knowledge or sources. | | | | | Joined: Oct 2012 Posts: 233 'Bolter | | 'Bolter Joined: Oct 2012 Posts: 233 |
1953 Chevy 3100 261 and SM420 53Chevy 31001953 Mack Firetruck 1972 Porsche 911 1986 Honda Goldwing
| | | | | Joined: May 2005 Posts: 8,877 . | | . Joined: May 2005 Posts: 8,877 | There was a kit with a switch and some little parts that attached to the shifter and top of the tower of the older models. I remember seeing pictures and discussion here or the old GMC forum. | | | | | Joined: May 2012 Posts: 574 'Bolter | | 'Bolter Joined: May 2012 Posts: 574 | I just bought a rebuilt sm420 tranny that came out of a '65 pickup that has the backup light switch attachment.
1949 Dodge Coronet 1955 2nd Chevy 4400 1.5 ton 1955 2nd Chevy 3100 1/2 ton 1955 2nd Chevy 3100 1/2 ton 1957 Chevy 5400 LCF 2 ton 1966 Dodge D100 Sweptline 1968 Chevy P20 stepvan 1969 GMC LWB pickup 1972 GMC Sprint 1974 CP30 shorty bus There are three things that I've learned never discuss with people: religion, politics, and the Great Pumpkin.----Linus Van Pelt Trying to understand the behavior of some people is like trying to smell the color 9  | | | | | Joined: Dec 2015 Posts: 2,061 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,061 | I drilled the top of mine and installed one like Maybellene suggested. Works great! The only thing I am going to add is a 2nd switch somewhere so I can turn them on and leave it running with the park brake on. That way, I can have them on when hooking up a trailer or working back there behind the truck. | | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | Wire in a timer to the bypass switch so you don't forget and leave it on to annoy drivers behind you- - - -maybe 10 minutes or so before switching off automatically.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jul 2000 Posts: 2,115 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,115 | If you use a 7 wire connector for your trailer, you can get a work light that plugs into the connector.
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
| | | | | Joined: Mar 2004 Posts: 6,189 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,189 | The set up Grigg is talking about shows up in my 1957 Chevrolet Accessory Installation Manual. The switch attaches to a new gear shift lever retaining cap and the light switch lever attaches to the gear shift shaft. When the trans is put in reverse the switch lever pushes down on the switch button turning on the lights. The part number is 987454. I'm not sure what year it was introduced, but it would work on ALL SM-420 transmissions. Mike B  | | | | | Joined: Nov 2005 Posts: 188 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 188 | Thanks guys. Now I need to locate one. ( down the list now til I get brakes working better ) pete | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Great photos, when tapping the hole, might want to test fit the switch occasionally, since if too deep, the rigid part of the switch will rest on the shift rail, negating the switch function.
ED
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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