1st Transmission Removal - TH350

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Hello Gents, it's been a while! I mostly lurk around the page reading threads and taking advice from others that have came before me. But now I have found myself in a predicament.

Back in Febuary I bought a 1962 C10 stepside with a 383 stroker and TH350 automatic tranny. I also drove across the country from Alabama to Arizona to pick up a rather rare utility bed for this truck...which is a very special project of mine. The truck had been turned into a drag truck - lowering spindles, they cut the rear springs decided they weren't low enough so they heated them and let the weight of the truck compress them further. My first order of business was bringing the truck back up to stock height, which went smoothly.

Well, while going down the interstate at 60mph the truck all of a sudden started revving real high. I pulled over and discovered that the TH350 tranny would not engage forward or reverse. So, I had it towed back to the house.

Later that night I started the truck, let it get warm and checked the fluid in the tranny and it looked a tiny bit low, so I added some and let it warm up. I had the back on stands, so I can test it. When I shift from Park to Neutral - nothing (good) then into Reverse - nothing (what the hell?) then in to Drive - nothing (SOB). I've came to the conclusion after a bit of reading that what is possibly wrong with the tranny is that either the converter or the pump went out.

And here we have come to the crux of my current problem. I've never pulled the transmission out of this truck....let alone any vehicle.
So, my question to you all is: how do I do this? Is it really as simple as drainging the oil, taking a few bolts out, and disconnecting a few things, or am I simply overthinking things? Oh, I will be doing this in my garage on the floor.

Does anyone here have experience in removing a TH350 tranny from a 1962 C10? Is there a thread on the forum that I possibly missed? Any advice? Can I simply remove the transmission or do I have to pull the engine and trans?

Would it be smarter to swap the trans over to a TH400 since it is already pretty stout or just build up the TH350 to handle the 383 Stroker?? Truck pictures are from before I raised it back to stock height.

[geezer#99]

It all depends on what trans crossmember you have.
Take a pic of the underside.

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Originally Posted by geezer#99

It all depends on what trans crossmember you have.
Take a pic of the underside.

I will have to take a picture of it when I return home on Tuesday.

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Originally Posted by geezer#99

It all depends on what trans crossmember you have.
Take a pic of the underside.

I was able to get my buddy to run over to my house and take pictures of the underside. It’s currently outside to make room inside my garage. Hope these help.

These links are to the pictures on imgur

https://imgur.com/NAVyZD6
https://imgur.com/DB3DdX2
https://imgur.com/uZueUyF
https://imgur.com/NAVyZD6

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Here are the same pictures from imgur, but directly to the forum......not sure why they're so big.



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[Braunschweiger]

Here is a picture of the Th350 in the '62 frame.
On mine the gearbox holder is in X and can be unscrewed.
Disconnect the battery, support the gearbox when you unscrew the holder.
Drain the oil, put a large pan underneath, it's always a mess.
You will probably have to remove the exhaust, at least on one side.
Disconnect the vacuum line, oil cooler lines on the gearbox, unhook the kickdown cable on the carburetor, loosen the shift linkage on the gearbox, remove the drive shaft, loosen the gearbox screws on top of the engine and unscrew them, then support the engine at the top so that it doesn't tip over when the gearbox is out. Then unscrew all the other gearbox screws and the starter. If you have a gearbox jack all the better, a second hand is also helpful.
The gearbox should come out backwards with a jerk.
Be careful that the converter stays on the gearbox and doesn't fall out.
I hope I haven't forgotten anything.