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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Catrik on December 10, 2019, 02:12:52 pm

Title: SM465 reverse light switch socket size
Post by: Catrik on December 10, 2019, 02:12:52 pm
1986 K10 with SM465, wondering what is the socket size for the reverse light switch? I don't have deep socket big enough and nothing else seems to fit there.

Sometimes is takes a second of two for my reverse lights to come on so I'm thinking there's some sludge build up in the switch.
Title: Re: SM465 reverse light switch socket size
Post by: JohnnyPopper on December 10, 2019, 08:52:01 pm
Sounds like gunk in the trunk, i.e. corrosion in the sockets.

Just found a incredible product from FLITZ called Metal Pre-Clean. Eats crap off surfaces like I have never seen before!

It is acid based, so you can't leave it on any surface but I tell you what: I have spent countless hours scrubbing off crap when this stuff melts it off in seconds.
Title: Re: SM465 reverse light switch socket size
Post by: bd on December 10, 2019, 09:37:30 pm
Flitz products seem to have fairly comprehensive applications...

https://www.youtube.com/watch?v=_KWxjShHl4E

Thanks.
Title: Re: SM465 reverse light switch socket size
Post by: vze2x5pt on December 12, 2019, 06:17:57 pm
To answer the original question mine is the original Pollak 2 blade style and it takes a 7/8" deep socket to remove it. there is a gasket around it that may not come with a new switch.
Title: Re: SM465 reverse light switch socket size
Post by: Catrik on January 21, 2020, 02:52:34 pm
Quote from: vze2x5pt on December 12, 2019, 06:17:57 pm
To answer the original question mine is the original Pollak 2 blade style and it takes a 7/8" deep socket to remove it. there is a gasket around it that may not come with a new switch.

Thanks! I somehow missed your message earlier. I used a 23mm socket so 7/8" is probably the correct size. Turned out that a deep socket was too tall to fit in there with a ratched so I ended up having to make a custom socket from a cut off box end of a spanner, piece of pipe and a nut in the other end so I could turn it with another spanner.

I opened up the old switch and it was burned up from the contact points. If anyone else has this issue then you could try turning the plastic connector part just a few degrees so the contact points change. It might fix it, or it might snap off and now you have a broken AND oil leaking switch...  ;D

Oh and good call with the gasket. I would have left mine sitting of top of the transmission if you didn't mention it.
Title: Re: SM465 reverse light switch socket size
Post by: JohnnyPopper on January 21, 2020, 03:46:01 pm
I like it! Going old school............."if you don't have one, make one!!"