No cast date on Muncie case

[Dave B.]

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I have a 69 muncie that doesn't seem to have the circle cast date on the main case. Is this a factory case or something else?

[Joe L.]

Re: No cast date on Muncie case

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I have a 69 muncie that doesn't seem to have the circle cast date on the main case. Is this a factory case or something else?

Dave------


I have no doubt that this is an original GM-manufactured main case. Also, the stamped characters indicate it was a 1969 model year case. I note that there is no VIN derivative stamping, though. This indicates that this transmission started life as a SERVICE unit.

[Kenneth B.]

Re: No cast date on Muncie case

Dont think the permanent mold castings had a cast date only manufacture date.

[Dave B.]

Re: No cast date on Muncie case

But what about the missing casting date. There should be a two circles above the fill hole that have a line through the middle. Half of the circle is suppose to have a number indicating month and 1-5 dots indicating week in the other half. Not sure what the other circle is for but this one has neither. That's what has me questioning this case as original.

[Mark F.]

Re: No cast date on Muncie case

But what about the missing casting date. There should be a two circles above the fill hole that have a line through the middle. Half of the circle is suppose to have a number indicating month and 1-5 dots indicating week in the other half. Not sure what the other circle is for but this one has neither. That's what has me questioning this case as original.

Hi Dave,

It's possible that the embossed plate with half circle and 1-5 dots was not secured into the die that stamps the sand-cast mold before the molten aluminum is poured to make the casting.

Everything else shown (except for the "P number stamp" and possibly the mold number; "7" in your case) is permanently part of the die (IOW, they are not changed at all for a given casting number - vs the casting date plate which does have to be changed periodically.

Also, with as many Munice cases as there are out there, hard for me to believe someone would go to the huge expense of making correctly-dimensioned and machined dies with appropriate markings to reproduce these aluminum castings. You probably couldn't sell enough of them to even break even on your tool and die costs - let alone having a facility with melt equipment to pour the castings. Just my 2 cents

[Joe L.]

Re: No cast date on Muncie case

But what about the missing casting date. There should be a two circles above the fill hole that have a line through the middle. Half of the circle is suppose to have a number indicating month and 1-5 dots indicating week in the other half. Not sure what the other circle is for but this one has neither. That's what has me questioning this case as original.

Dave------

My original Muncie 4 speed transmission from my original owner 1969 has no casting date ("bisected circle" or otherwise) to be found anywhere on the case. I am 100% certain that your case is an original Muncie case. While Muncie cases have been reproduced by Auto Gear in the last 15 years, or so, they are configured somewhat differently than original cases and no one would ever mistake one of them to be original. I know of NO reproductions EVER of the original case configuration including GM casting and patent numbers.

[Dave B.]

Re: No cast date on Muncie case

OK,
Those last two posts makes me feel better about this case.

[Mark F.]

Re: No cast date on Muncie case

Dave------...While Muncie cases have been reproduced by Auto Gear in the last 15 years, or so, they are configured somewhat differently than original cases and no one would ever mistake one of them to be original. I know of NO reproductions EVER of the original case configuration including GM casting and patent numbers.

Hi Joe,

Thank you for correcting me and my apologies for not being fully informed about folks who HAVE gone to all that trouble Sheeesh!

[Joe L.]

Re: No cast date on Muncie case

Hi Joe,

Thank you for correcting me and my apologies for not being fully informed about folks who HAVE gone to all that trouble Sheeesh!

Mark------

Actually, the Auto Gear case is better than the original Muncie cases. They have improved on the Muncie case in just about every way that the originals were deficient or weak. However, as I mentioned, no one is going to mistake one for an original case. The fact is that in order to make the improvements, certain very visible elements of the case configuration were changed.

Most Muncie internal parts, unavailable for many years, have also been reproduced. The gears are manufactured by Masiero S.A., an Italian gear manufacturer and one of the largest manufacturers of gears in the world.