400 turbo to either 350turbo or 700r4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 03-25-2005, 08:17 PM

What would I need to do to convert from a 400 turbo to either a 350 turbo or a 700r4?

Thanks

cableguy0 · 03-25-2005, 08:46 PM

different driveshaft different yoke on the driveshaft. if you swap to a th350 you can use the torque convertor from the th400. the 700r4 needs a few extras. why are you swapping i know you had problems with the builder on that th400 but i would never downgrade like that. the th400 is twice as strong as both of those trannies

skokie · 03-25-2005, 08:52 PM

Not swapping yet. But if he cant get the 400 going and offers up the 700 I am goingto take it. I want the overdrive

As far as tranny strength goes it is a stock engine. So if it can handle that I wil be happy and on a side note I can put my 3.73 rear back in

cableguy0 · 03-25-2005, 08:56 PM

oh ok you should be fine either way then. personally i would keep the th400 as most know i totally dislike 700r4's. tearing the seal going on the drum putting it into the case happens and isnt usually noticeable when ya do it putting a unit together. im betting your problem will be fixed when they put a paper and rubber kit in your tranny

03-25-2005, 08:17 PM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,342	400 turbo to either 350turbo or 700r4 What would I need to do to convert from a 400 turbo to either a 350 turbo or a 700r4? Thanks __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

03-25-2005, 08:46 PM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	different driveshaft different yoke on the driveshaft. if you swap to a th350 you can use the torque convertor from the th400. the 700r4 needs a few extras. why are you swapping i know you had problems with the builder on that th400 but i would never downgrade like that. the th400 is twice as strong as both of those trannies __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

03-25-2005, 08:52 PM	#3
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,342	Not swapping yet. But if he cant get the 400 going and offers up the 700 I am goingto take it. I want the overdrive As far as tranny strength goes it is a stock engine. So if it can handle that I wil be happy and on a side note I can put my 3.73 rear back in __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

03-25-2005, 08:56 PM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	oh ok you should be fine either way then. personally i would keep the th400 as most know i totally dislike 700r4's. tearing the seal going on the drum putting it into the case happens and isnt usually noticeable when ya do it putting a unit together. im betting your problem will be fixed when they put a paper and rubber kit in your tranny __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.



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