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Old 08-17-2013, 01:33 PM
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Yoke for Muncie trans. This is strange?

My 62 Studebaker Lark Chevy V8 conversion. Everything's done even took it for a short spin. Has a 327, Muncie m21 and ford rear. Had new driveshaft made by Denny's Driveshaft. Fine so far. Get everything together and find it's leaking trans fluid like a sieve. So get under it and find that it's coming from the driveshaft yoke. When you look from the back side of the yoke (where the u-joint is) into the trans where the splined shaft goes it's open. I can see all the splines and the fluid is just running out. I'm no expert but I think this is supposed to be sealed. So can I get a plug to put in there? The opening is stepped like one fits like a core plug on an engine. Or am I going to have to pull it all apart and get a new yoke. The yoke is new, but I bought this about 18 months ago. It just took me this long to get everything together and running. I can't believe they shipped it like this. Thanks

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Old 08-17-2013, 02:26 PM
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Originally Posted by Dougie View Post
My 62 Studebaker Lark Chevy V8 conversion. Everything's done even took it for a short spin. Has a 327, Muncie m21 and ford rear. Had new driveshaft made by Denny's Driveshaft. Fine so far. Get everything together and find it's leaking trans fluid like a sieve. So get under it and find that it's coming from the driveshaft yoke. When you look from the back side of the yoke (where the u-joint is) into the trans where the splined shaft goes it's open. I can see all the splines and the fluid is just running out. I'm no expert but I think this is supposed to be sealed. So can I get a plug to put in there? The opening is stepped like one fits like a core plug on an engine. Or am I going to have to pull it all apart and get a new yoke. The yoke is new, but I bought this about 18 months ago. It just took me this long to get everything together and running. I can't believe they shipped it like this. Thanks
Sounds like a later style Muncie that uses a yoke w/the same splines as the TH400. Some TH400 truck yokes have a threaded hole that was used to bolt the yoke to the truck trans output, this is prolly what you have.
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Old 08-17-2013, 07:00 PM
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No. It's an early Muncie. Now that I've researched it, it looks like there should be a plug, like a core plug in there that is missing. Anyone know what the diameter would be on that plug?
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Old 08-18-2013, 05:47 AM
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use a vernier,use a bolt if threaded,buy plug from GM?
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Old 08-18-2013, 12:27 PM
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The hole should be plugged, it's there from the manufacturing process of cutting the splines. Measure and replace w/a freeze plug if there's one close enough.

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Old 08-26-2013, 07:01 AM
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Thanks. I was on vacation last week without internet. I'm going to pull the driveshaft and measure it looks like it's 1 1/2" diameter.
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Old 08-26-2013, 08:03 AM
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I would have expected Denny's Driveshaft to install the plug as part of shortening the driveshaft.
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Old 08-26-2013, 09:16 AM
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Dennys' didn't shorten the dricveshaft. It was new. I had it on the car and it didn't leak. I had a problem and then had it balanced. When I reinstalled it, it leaked and I noticed the missing plug. I can see from where it was painted that a plug was in it originally. I suspect that maybe when the other shop balanced it maybe they could have pushed it out with the spline they had on the balance machine. Does that make sense?
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Old 08-26-2013, 11:31 AM
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I suspect that maybe when the other shop balanced it maybe they could have pushed it out with the spline they had on the balance machine. Does that make sense?
Possibly. If the balancing shop is local, I'd give them a call/visit. If it was because of them the plug's missing, I'd expect them to take care of replacing it or as a bare minimum at least give you a plug to replace it yourself.
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