Muncie M22 Back Up LIght Switch Help - LS1TECH - Camaro and Firebird Forum Discussion

Pontiac Firebird 1967-2002 Birds of a feather flock together

Muncie M22 Back Up LIght Switch Help


Old 09-13-2017, 09:43 AM
Registered User
Thread Starter
Join Date: Sep 2017
Posts: 1
Default Muncie M22 Back Up LIght Switch Help

I just did a total rebuild of my 1970 Formula 400 Firebird and cant figure out what this plug was for that is in the side of the transmission. If its the back up switch plug I cant find one anywhere. Any help would be greatly appreciated.


Attached Thumbnails Muncie M22 Back Up LIght Switch Help-fb120170912_162840.jpg   Muncie M22 Back Up LIght Switch Help-fb220170912_162911.jpg  
formula400guy is offline  
Reply With Quote
Old 09-14-2017, 08:35 PM
TECH Apprentice
Join Date: Nov 2001
Location: Lititz, PA
Posts: 336

When your car was new, I believe that switch detected when you are in 4th gear. It then operates a solenoid that applies vacuum to your distributor vacuum advance can.

As for the reverse backup switch. On your transmission, you should have a switch and a small link that attaches to the reverse shift lever. The reverse lever is the rearmost of the three levers. This pic is from my '73 Corvette. You can probably get a backup light switch assembly for your car from one of the many restoration companies. You can see the photo below shows the same switch on my Muncie 3/4 shift lever.

Muncie Backup Light Switch.
JohnR is offline  
Reply With Quote

Thread Tools
Search this Thread
Quick Reply: Muncie M22 Back Up LIght Switch Help

Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: