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Old 06-23-2011, 09:35 AM
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1969 muncie 4 speed transmission

I have an 1969 muncie 4speed trans, when you pull the nose cone is there suppose to be a oil seal because it leaks oil out the fornt of it.

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Old 06-23-2011, 09:44 AM
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1969 muncie 4 speed transmission

I have an 1969 muncie 4speed trans, when you pull the nose cone is there suppose to be a oil seal because it leaks oil out the front of it. how can i date code it. shifter plate num. is 3953648 main body num. is 3925661 and the nose cone num is 3915020. please help, thanks jerry
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Old 06-23-2011, 01:22 PM
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Yes there was an oil seal in there on some later models. But usually if they leak oil out the input shaft it is either overfilled, and/or the oil slinger is missing on the input gear bearing.
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Old 06-23-2011, 03:00 PM
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Or someone boogered the front bearing nut with a pair of channel locks.

Some aftermarket input shafts don't have enough threads for the nut and it'll always leak. Last input I saw that did that was marked 'SMI'
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Old 06-23-2011, 03:01 PM
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If the trans takes a seal, you should see evidence of the seal riding on the input shaft. Some inputs dont have a seal worthy surface. Some brearing retainers dont have a bore to install a seal, yet some do but the trans did not come with one. Maybe Autogear will chime in with the complete info.
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Old 06-23-2011, 03:53 PM
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Hi
Yes there is a gasket that goes behind the bearing retainer (nose cone) a whole transmission gasket & seal set cost about $25.
Rich
PS http://www.ecklerscorvette.com/corve...roduct_Related
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Old 06-23-2011, 05:30 PM
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Some transmissions had seals, but I do not remember any Muncie 4-speeds having one, but you should be able to see the old one and just replace it if it has one.

Also, all the 4-speed trans that I remember had a oil slinger on the input shaft. Might check for that being missing.

Over filing was the major reason the Muncie 4-speeds leaked out the front.
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Old 06-23-2011, 06:05 PM
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Corvette Transmission Gasket & Seal Kit, Muncie 4-Speed, 1963-1974

Click on above image to view full picture(s)

1963-74 (C2, C3) Muncie 4-Speed Transmission Gasket & Seal Kit
Corvette Transmission Gasket & Seal Kit, Muncie 4-Speed, 1963-1974

Manufactured From Factory Grade Gasket Material
USA Made Seals

.................................................. ...1964 -74 front retainer gasket
Kit includes side cover gasket, 1963 & 1964 -74 front retainer gasket, tail-housing gasket, mid-plate gasket, 1963 - 70 small and 1970 - 74 large tail-shaft housing seal, three shifter shaft seals and a speedometer fitting o-ring.
Part #: 42628
Price:
$21.99 Set
Low Price Guarantee
Qty:
Availability:
In Stock

Hi Mark everything going well?

Last edited by richard stewart 3rd; 06-23-2011 at 06:11 PM.
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Old 06-24-2011, 07:55 AM
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OEM muncies used a 'gland nut', 'windback threads' or 'front bearing nut' (GM P/N 591150) This was a GM design since the 1930s. The idea is the oil hits the backwards threads and the oil is slung back up the shaft, thereby preventing it leaking. I use 'preventing' loosely as they always dripped a little oil (there is a weep hole to allow oil to escape without contaminating the clutch surface).

In response to the seal type; There are seal-type inputs (sometimes called a maindrive) for the Muncie. And there are 2 ways to go about them.

First way (very short explanation for illustration) : mock up the standard input with the nut and note how many threads are left after you snug the nut down. Disassemble. Turn the 'extra' threads off and use a special oilseal on your newly created surface (Auto Gear 0-044-011 / MCL 2400220). You will need to modify the nose cone (input bearing retainer) as well (easier to buy the proper retainer for less than $30)

Second way: Buy an Auto Gear 'oil seal maindrive' and the specific Auto Gear oilseal-type input bearing retainer.

We're the only ones that make them, and they're marked either Antonio Masiero (an AM mark) or Euroricambi (which is a pyramid shaped E)
Retainers have Auto Gear cast into them with pn 18-027-002 (standard size) or 18-027-004 (5.125" dia truck bellhsg seal-type retainer)

You could have accidentally covered the weep hole as well.

If anyone wants to attempt the thread to seal conversion, contact me first and I can help you with some specifics; this is definitely measure twice, cut once territory. My suggestion is to get a new input and nosecone though.

EDIT: In response to Richards post, 63 only Muncies have some subtle variations and usually can be problematic when you use 64-65 parts in them. There is a 63 specific gasket set out there.
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