Muncie 4 speed problem?? - Team Camaro Tech
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post #1 of 10 (permalink) Old Jun 1st, 06, 07:51 PM Thread Starter
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Dave
 
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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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post #2 of 10 (permalink) Old Jun 1st, 06, 08:13 PM
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Tom
 
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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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post #3 of 10 (permalink) Old Jun 1st, 06, 08:32 PM
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Steve
 
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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.

Steve
1967 Camaro
I drove it for the first time in 1972 when I was 15.
1956 Bel Air Sport Coupe
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post #4 of 10 (permalink) Old Jun 2nd, 06, 03:53 AM
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Gary
 
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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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post #5 of 10 (permalink) Old Jun 2nd, 06, 05:52 AM
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John
 
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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.

Lemans Blue 69 RS/Z28
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post #6 of 10 (permalink) Old Jun 2nd, 06, 09:06 AM
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Mark
 
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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..

Mark
Long Gone: 1984 Z28, 1989 RS
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post #7 of 10 (permalink) Old Jun 3rd, 06, 04:18 AM Thread Starter
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Dave
 
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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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post #8 of 10 (permalink) Old Jun 3rd, 06, 05:01 PM Thread Starter
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Dave
 
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Re: Muncie 4 speed problem??

Where can I purchase the "torque lock "syncro to fix my prob?
thanks
Dave
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post #9 of 10 (permalink) Old Jun 3rd, 06, 09:03 PM
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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.


Larger Dave
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post #10 of 10 (permalink) Old Jun 4th, 06, 06:04 AM
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John
 
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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

Lemans Blue 69 RS/Z28
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