Transmission crack help

[Rodney78]

Afternoon folks. I have a question, I’ve got a 1978 Chevy Scottsdale with an automatic transmission that the drive gear had stopped working so I took the pan off and found a hole in the metal that had broken (see pictures) I couldn’t find any metal in the fluid. I have no experience with transmissions so my questions are what is broken if you are able to tell and is it fixable or do I need a new transmission? Thanks to everyone who can help.

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[Matt69olds]

I don’t think anything is broken, pretty sure that’s just the way the case is cast. The bottom portion has just normal casting flash, the top is cast smooth. I don’t have another case to compare, but since you don’t have chunks in the pan, and the kickdown band is clearly visible, I don’t think that’s your problem.


How much crud is in the pan? If it backs up but won’t go forward, chances are the forward clutch has burnt up. It’s time for a rebuild.

 

[Rodney78]

I don’t think anything is broken, pretty sure that’s just the way the case is cast. The bottom portion has just normal casting flash, the top is cast smooth. I don’t have another case to compare, but since you don’t have chunks in the pan, and the kickdown band is clearly visible, I don’t think that’s your problem.


How much crud is in the pan? If it backs up but won’t go forward, chances are the forward clutch has burnt up. It’s time for a rebuild.

Oh wow okay and yes it will go well in reverse no problem. I’ll be looking for a rebuild kit, thank you sir.

Very little crud was in the pan for being the original transmission. I even ran a magnet through the fluid and only very fine metal shavings nothing big.

 

[Raider L]

Man, it sure does look like a chunk is missing out of that part. And, @Matt69olds, you say that's normal? I'm like @Rodney78, I would've freaked out, "Oh my god my trans is screwed!" If it was broken out right there what would you have to replace? The case?