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Old 09-16-2004, 09:09 AM
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Question What's needed for a th350 to a th400 swap?

I have a SBC 350 that will be replaced (2-5 years) with a Supercharged 454 BBC. At this time my car has a th350 that is shot. It's not my daily driver, so instead of buying another th350 I'm thinking of putting in a th400.

I looked in Jegs and found a TCI streetfighter tranny http://www.jegs.com/cgi-bin/ncommerc...06&prmenbr=361 it holds up to 450hp non-supercharged engine, selling for around $729. I know that it would work great for my current powerplant but it would not hold up for my future project.

So after looking around on the net, I came across this site called Monster Motor sport. They have a th400 that holds up to 950 hp and it would hold my current and future engines and are only selling for $100 more than the TCI tranny. http://www.fearthemonster.com/transm...duty/turbo400/

I don't mind paying a little more for peace of mind. Have you guys ever dealt with or even heard of this company? Also what do I need for a complete swap from a th350 to th400? I am currently running 3.73 gears. I noticed that the TCI tranny has 2.75 1st gear that sells for a couple of hundred more. Would I benefit from that considering my current rearend gears?

I don't know if it makes any difference but I only plan on taking it to the strip maybe twice a year. The car is a 1972 Chevy Nova auto.

I don't know if it makes much of a difference but my car is a 1972 Chevy Nova auto. I will maybe take it twice to the strip a year. I don't plan on abusing it.

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Old 09-16-2004, 12:19 PM
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Sorry I don't have any answers for you....just wanted to chime in and say that I am in the process of building a 48 Chevy pu lovingly named the junkyard truck. I was wanting to install a 700r4 in it but was just given a th400 which will obviously save me some money. I have been advised not to use the 400 by some friends because it takes too much horsepower and the output shaft is bigger. After some long thinking, which is hard for me, i've decided to go ahead with the 400 as I need to save as money as possible.
What I am wondering, as you are, besides a new flexplate what will I need and what should I do to the tranny before I install it? THanks in advance.
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Old 09-16-2004, 02:09 PM
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Not too much to change.
Flex plates are the same.
You may have to move the cross member back a bit.
Inspection cover.
The drive shaft will have to be altered to accept the larger diameter yoke.
Any competent machine shop can do this for you.
No KD linkage to be concerned about just an electrical connection for passing gear..
Cooler lines are good.
A bit of modification of the manual linkage.
A slightly shorter vacuum line.
Filler tube.
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