TH350 to TH400 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Locutus · 09-03-2003, 07:19 PM

My truck has a fried TH350 in it. I was planning to have it rebuilt and beefed up a little, but a friend offered me a TH400 for free. I know the 400 is supposed to be tougher. What are the other differences. How much will it affect my rpms at 70-80(I am a volunteer firefighter so I occassionally do run 80 down the hiway). Right now around 70 I get about 3500 rpms. Will I use the same crossmember in the same location? I do know I will need a TH400 yoke. Is the length the same or will I have to get my driveshaft cut? I am trying to decide if the swap is worth the money and effort.

09-03-2003, 07:19 PM	#1
Locutus Registered User Join Date: Jan 2003 Location: Santa Fe, Texas Posts: 249	TH350 to TH400 My truck has a fried TH350 in it. I was planning to have it rebuilt and beefed up a little, but a friend offered me a TH400 for free. I know the 400 is supposed to be tougher. What are the other differences. How much will it affect my rpms at 70-80(I am a volunteer firefighter so I occassionally do run 80 down the hiway). Right now around 70 I get about 3500 rpms. Will I use the same crossmember in the same location? I do know I will need a TH400 yoke. Is the length the same or will I have to get my driveshaft cut? I am trying to decide if the swap is worth the money and effort.

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