What Trans is this ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Accelo** · 02-13-2023, 01:01 PM

Yup, the board nailed it.
These were typically used on 1T trucks and motor homes. The bolt on yolks style had the slip joint in the driveline. I included a picture of the output shaft and parts below.
There are at least 4 different style yolks and many require a different style and matching output shafts. They very on how they seal. Some yolks are vented some are not. Some have an "O" ring on the output shaft. A lot of mistakes are made in the interchange. If not done correctly you end up with a leaking output.

To complicate things there is a 375 transmission which is a THM 400 with a 350 style output shaft.
Cheers

02-13-2023, 01:01 PM	#1
Accelo Senior Member Join Date: Mar 2015 Location: washington Posts: 2,213	Re: What Trans is this ? Yup, the board nailed it. These were typically used on 1T trucks and motor homes. The bolt on yolks style had the slip joint in the driveline. I included a picture of the output shaft and parts below. There are at least 4 different style yolks and many require a different style and matching output shafts. They very on how they seal. Some yolks are vented some are not. Some have an "O" ring on the output shaft. A lot of mistakes are made in the interchange. If not done correctly you end up with a leaking output. To complicate things there is a 375 transmission which is a THM 400 with a 350 style output shaft. Cheers Attached Images Last edited by Accelo; 02-13-2023 at 01:25 PM.



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