73-87 Chevy _ GMC Trucks > Engine/Drivetrain

What transmission do I need?

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Rough75C20:
Hello,

I’m waiting on a transmission to be rebuilt, but can no longer wait as the place I’m storing it needs it moved. I don’t have the transmission and the guy rebuilding it won’t contact me. The guy probably stole it. Either way, I need to figure out how to know what th350 I need. Are there different versions? I have the two piece driveshaft and it is a 2wd long bed with a 305 engine. How do I tell?

Thank you


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zieg85:
TH350 with a 9" tail shaft should have been in there if it was always an automatic.

Rough75C20:

--- Quote from: zieg85 on November 04, 2025, 06:13:25 pm ---TH350 with a 9" tail shaft should have been in there if it was always an automatic.

--- End quote ---
Awesome. I’ll look for that. Anything else that I need to look for other than the 9 inch tail shaft to make sure it will work with the driveshaft?

zieg85:
Output shafts are all the same spline in the TH350 and TH350C.  A 700R4 swaps in if you move the cross member a little.  Attached is measurements

VileZambonie:
If you are going to get a new transmission grab an extra gear and go with the 700R4

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