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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Rough75C20 on November 04, 2025, 04:56:57 pm

Title: What transmission do I need?
Post by: Rough75C20 on November 04, 2025, 04:56:57 pm

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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Title: Re: What transmission do I need?
Post by: 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.

Title: Re: What transmission do I need?
Post by: Rough75C20 on November 04, 2025, 06:24:45 pm

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.

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?

Title: Re: What transmission do I need?
Post by: zieg85 on November 04, 2025, 07:08:10 pm

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