Any non electric 4 speed autos for a 360 mag out there?

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The planetary gears run on a shaft right? Like a solid steel cylinder about 3/4" in dia, maybe 6" long. The gears wore that shaft in half, I mean where they ride on that shaft/cylinder. I have to attach a pic of it, but I have to get a picture of it first. Lemme work on that and you will be able to see what I'm referring to. Yeah I spun one wheel a few times, but nothing like a lot. Maybe once or twice at full throttle, didn't need to do that, just fun, but it was a dog taking off with a 318 in it. I think I popped the clutch one time in it and it slipped the clutch so I stopped immediately. I had a standard 318 in front of it. But that was the extent of abuse I put it through. Could that little bit of abuse caused something like that? Again, I will attach or insert a pic maybe tomorrow. I have it still, if I can find it, lol? And yeah, it was probably pushing 200k miles... with all that said, I don't know how the person before me drove it!
Thanks

You popped the clutch........ with something that has planetaries in it ......... I'm more than a little,confused,lol.
It sounds more like a cluster-pin in a 4 speed which is perhaps 8 or 9 inches long. Then the planetaries of which you speak would perhaps correspond to the mainshaft gears.
In any case there is no .75x6 shaft in a TorqueFlite.
So I'm going with A833 if there are 4 gears in it, and A230 if a 3-gear. This makes the most sense to me.
If that is true and that trans wore out the cluster pin to 50%, that would be highly unusual;
unless the needle rollers got shattered,also highly unusual,
or if someone assembled it with an incorrect number of rollers in there, easy for a newbe to do..
In any case either of these transmissions when correctly assembled will take anything your Street-SBM can dish out.
But I wouldn't re-use that particular manual trans. Since it wore out the cluster pin, all the gears have been running at an angle and digging the corners into eachother. They will probably be very noisy and IMO will shed teeth when pushed too hard, especially at whatever end the pin was worn out at. And furthermore, if the case is aluminum, then the front hole is probably egg-shaped, and once that starts, it's all over for that trans.