I'm restoring a '68 cam. convert. that was originally a powerglide and now has a Muncie 4-speed. I replaced the seal on the tailshaft but since there is no seal on the front I just re-sealed the coverplate. Problem is all my gear oil has leaked out. Can anyone tell me what needs fixed?

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Muncies can leak from a number of places. The front bearing retainer, thats' the deal that goes over the imput shaft and holds the front bearing in place and provides a place for the throw-out bearing. It has a paper seal. The other place it can leak is where the cluster shaft comes out the front of the case. It's a loose fit anyway, when it gets real loose it will leak. The fix is ugly, take trans apart and do one of two things, bush the exsisting shaft if it is the large shaft. Bore the shaft hole from 7/8 to one inch if it is the small shaft trans. But, and there is always a but, if you do the latter, you will need to replace the shaft, all the roller bearings, all 120 of the little suckers, and last but not least the counter gear itself, pricey.

You can also bush the 7/8 case, a cheaper alternative.

But if bucks a a problem, do what most people do, slop some silicon on the thing, it won't fix it and may not stop the leak.

Other places that can leak are the side cover, shift arms, center support plate. You get the idea. Not a straigt foward deal.

I had the same problems on a M - 20 muncie the leak around the counter shaft was sealed with J B weld. All the seal for the selector shafts are still avalible thru Classic Muscle at 1-800-722-4828. The other seals are also avalible there too.

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johnny

Don't buy anything for a muncie from any classic car resto place, you will pay way more than it is worth. If you need seals or parts there are lots of places to buy them cheap, email me and I will provide you some sources.

Cluster gears different between 7/8 and 1" shafts??? That's a new one on me. I never had any problems as long as you use the correct bearings.

If it is leaking around the shaft there is a new shaft availiable that has an O-ring to prevent leaks.
Ron

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95 Z28 Convertible 6 speed, 70 Chevelle SS 396, 66 Nova SS 327 M21

Or just clean it real well with some brake cleaner, and wipe some clear silicon on it. Stops the leak around the pin everytime!

I would not recommend using silcone on the front bearing cover. Get the proper paper gasket. The silicone can clog up the drain hole. I sealed the counter shaft with silicone. It seems to be working.

First of all guys,silicone has no where near a ball bearing to do!
It WILL wrec havoc on the bearings in the SHORT run.
IF you at the moment donīt have any choice,be VERY careful with the stuff.

Leakage on Muncies then.
Often overlooked is the fact that the front "nut" that is screwed onto the input shaft also works as an oil slinger.
When somebody takes the box apart they often lack the special tool to take this "nut" off.
Soo...gorilla time.
Easy enough to check.
Take off front bearing retainer.
Check to see that the slinger is in place-large rounded side towards retainer.

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DVC-2000.Racing
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