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  #1  
Old Jun 1st, 06, 06:51 PM
dgmz28 dgmz28 is offline
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Default Muncie 4 speed problem??

Hello, I have a Muncie M22 in a '69 camaro...the problem is, it pops/jumps out of 2nd gear when going down a hill w/o accelerating, i.e. using the engine compression to slow/ brake the car. It doesn't jump out of gear when under normal acceleration.Also no grinding when shifting, thru all four gears.
What could the problem be? thanks!
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  #2  
Old Jun 1st, 06, 07:13 PM
kilroy396 kilroy396 is offline
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Tom
 
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Default Re: Muncie 4 speed problem??

I had a M21 in a 69 SS396, with the same problem, I was told it was a bad
2nd gear syncro
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  #3  
Old Jun 1st, 06, 07:32 PM
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Farm Boy Farm Boy is offline
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Steve
 
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Default Re: Muncie 4 speed problem??

Your Muncie is wearing out. Second gear, and the slider that connects it to the hub, have worn enough that it pops out of gear. A new Torque Lock slider is fairly inexpensive and will stop the problem for a while if your second gear is not too bad.

A longer lasting solution would be to rebuild it with all new gears, hubs, blocker rings, bearings, and small parts. It will be more expensive but your Muncie will last another four decades.

Either way the transmission must be disassembled.
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  #4  
Old Jun 2nd, 06, 02:53 AM
Unreal Unreal is offline
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Gary
 
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Default Re: Muncie 4 speed problem??

Why use the engine to decelerate? Brakes are a whole lot cheaper to replaced than clutches and trannies.
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  #5  
Old Jun 2nd, 06, 04:52 AM
John3366 John3366 is offline
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Default Re: Muncie 4 speed problem??

I have a similar problem. I was told is caused by wear on the engagement teeth for 2nd gear. The teeth are normally rounded or slightly pointed at the front and then have flats on the sides. As the flats receed back from wear, the slider can pop off when not under load. To fix the problem, 2nd gear has to be replaced. The slider could be contributing as well, both should be replaced. At least this is what I was told.
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  #6  
Old Jun 2nd, 06, 08:06 AM
dragon0123 dragon0123 is online now
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Mark
 
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Default Re: Muncie 4 speed problem??

yup/.. trans need to be rebuilt.. at least those 2nd gear pieces. while your at it have them look at 3rd too casue thatll be the next to go..
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  #7  
Old Jun 3rd, 06, 03:18 AM
dgmz28 dgmz28 is offline
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Thumbs up Re: Muncie 4 speed problem??

Thanks to all that gave input & suggestions...by major conscienous it sounds like 2nd gear & the slider is the culprit. For how often I run it (1000-1500 miles) a summer, I will replace just those pcs.

thanks again for your help.
Dave
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  #8  
Old Jun 3rd, 06, 04:01 PM
dgmz28 dgmz28 is offline
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Default Re: Muncie 4 speed problem??

Where can I purchase the "torque lock "syncro to fix my prob?
thanks
Dave
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  #9  
Old Jun 3rd, 06, 08:03 PM
Larger Dave Larger Dave is offline
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Dave
 
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Cool Re: Muncie 4 speed problem??

I doubt if the gears are worn to the point of it popping out of gear. But I'll wager the syncro's are shot. I would definitely rebuild it if you are familiar with the procedure; particularly if you have a numbers matching tranny. Otherwise you can purchase a rebuilt one with all new replacement parts installed ready to run on line and send them your core. When I was younger we used to swap Muncie's after every missed shift, so there are very few numbers matching four speeds around. If yours is a numbers matching it can be rebuilt by any competent shop (i.e. dealership), as I wouldn't let it out of my sight.


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  #10  
Old Jun 4th, 06, 05:04 AM
John3366 John3366 is offline
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Default Re: Muncie 4 speed problem??

Get in touch with Craig Wright, I think his site is wrightconnection.net. He rebuilds Muncies and sells parts out of California. He's a real good guy and talked me through rebuilding mine with some good pointers. You can also find detailed rebuilding instructions on the web. It's fairly easy and takes a few hours to assemble after you've got it a part. Good Luck
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