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Old 08-03-2003, 07:56 PM
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Leaking Transmission

My M21 4-speed leaks a lot of fluid. I wouldn't be so concerned about it if it was just a slow leak - - but it leaks a whole lot, and it makes an awful mess out of my garage. So forgive me if this is a naive question (I suspect it is) but what can I do to fix this? Is a rebuild the only option?


Other details,: '66 Nova SS w/'72 350.

Thanks

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Old 08-03-2003, 08:10 PM
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Hard to say, with the little detail you provided, could be just a tailshaft seal, or could be an entire gasket set replcement.

If you want to sell it, shoot me an email <grin>

Vince
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Old 08-03-2003, 08:23 PM
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I just heard something the other day about a common leak on 4 speeds, but not sure if it was muncie or t-10's. At the front of the case there is a plug over the countershaft hole ( whereyou install the countershaft), I'm not very familiar with Muncies, and maybe somebody else knows if this is a problem on them, if it is you could check into a replacement plug they are supposed to have out there . This would not require disassembly, but rathere just R&R it, install the new plug. Like the guy before me said, based on your info it is a little hard to tell. List where you think the leak is, Front , side ,or rear. HTH
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Old 08-03-2003, 08:23 PM
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Sorry the detail is so sparce! My experience is quite limited, so I was hoping for some advice on how to start. I haven't pinpointed exactly where the leak is coming from. I guess that might help! Any ideas on some common leaking areas (you mentioned tail shaft seal)?

Ooops, I didn't see your reply there, 66Chev!
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Old 08-03-2003, 08:41 PM
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Looks like we were tal,king at the same time. Like I said I'm not real familiar with muncie, but know BW T-10 's leak there in the front. I used to silicone the plug in my 4 speed days 40 years ago so a lot has changed. good luck.
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Old 08-04-2003, 09:28 PM
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Trans has a front seal inside the bearing retainer, rear seal around the drive shaft yoke, and a seal at each shift lever where it comes out of the side cover. The shift lever seals are famous leakers. Clean it off real good & see if you can find where it's coming from. Here's a source for Muncie ID & parts:
http://www.dandltransmission.com
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Old 08-05-2003, 06:10 AM
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Thanks for the reply, Jimfulco:

Regarding the common areas you mentioned: does repairing them involve removing the transmission, or is the fix a little more simple?
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Old 08-05-2003, 06:59 AM
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Tailshaft seal is replaceable without trans removal, seals around shifter shafts does not require rmoval just some patience picking them out or removing the side cover which also has a gasket. The front seal under bearing retainer requires removal. I think there is also a gasket between the retainer and the case. If I were you I would clean it off, find out where it is leaking, remove it and replace all gaskets and seals. Just thought of something else, could the case be cracked?
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Old 08-05-2003, 07:01 AM
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Jeez, well if that's the case (cracked case) then I'll know the transmission will need removal!
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Old 08-05-2003, 02:31 PM
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Im with 66chev wipe down trans,fill up trans and put newspaper under trans at least you can the pinpoint the leak.And if the case is cracked you can pick up a "super case" for it.
http://www.5speeds.com/case.html
Unless you want to throw it out (you can throw it my way=)
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Old 08-05-2003, 05:54 PM
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Thanks guys:

As an aside (and if my ignorance hasn't been obvious, this should do it) how long do you think I can have my car on my jack stands? I just bought two more, so now I have four. So I'm going to put it on all four. Is there a limit to how long I can have it on the stands?
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Old 08-05-2003, 06:53 PM
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If you put it on concrete you can leave it up for a while.Tar is not the best when its warm out it will sink in.I have spots all over my driveway where I just left something on it for a day.Make sure your jacks are the sturdy ones and give the car a shove to make sure it's on them solidly.A car falling on you can wreck your whole day.I don't know what your mechanical ability is but its not the most difficult thing in the world to change SOME of the seals/gaskets on a transmission,There are plenty of knowledgable people on this site that can help.I personally need a repair manual to do anything,to me their worth more than what you pay for them.
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Old 08-05-2003, 07:31 PM
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I have a '66 Chevy shop manual. It isn't the greatest. I also have an assembly manual. Unfortunately, the transmission isn't stock - - though I've heard that the M21s are pretty much the same throughout '64-'74 (don't quote me on that!).

Last edited by 66chevy2ss; 08-06-2003 at 06:09 AM.
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Old 08-06-2003, 06:11 AM
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Another side question: is it o.k. to run the engine and go through the gears with it on stands?

It may be that the leak only happens after the gear oil has circulated throughout the transmission.
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Old 08-06-2003, 08:47 AM
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Muncie's and T10s were bad to leak at the counter shaft plug in the front of the case. they are easy to replace then silicone before installing. As has already been posted.

Go ahead and check it out for leaks, there could be more than 1.

Good Luck

Troy
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