I might end up building a 454 for my Z28. I know the 700-R4 will be disappearing soon , and I want to know how much power a stock TH400 will handle. Is it a direct bolt-in replacement for 700-R4? Is a new driveshaft going to be necessary?

 

It is not a direct bolt-in. The crossmember will have to be moved; it will need a vacuum line to its modulator since it uses the sensilbe system of engine vacuum to determine the shift point instead of the stupidity of a cable; and it uses an electric kickdown switch (usually mounts on the gas pedal bracket).

The driveshaft will certainly need work. Apart from the length, it uses a totally different spline at the rear of the trans.

Here's a pic of the yoke splines for a Camaro, and one for a Turbo 400.

 

This is going to be a royal pain in the @$$, isn't it?

 

Hard to say..... the work is what it is, all the rest of that is all in your head

 

ive got a vaccum modulator and a kickdown cable on my th350. heh


I still need a friggin driveshaft!! lol

 

i can help you with driveshaft, i have an 82 thm200c one and an 84 t/5/700r4/longtail th350 one here, 3" difference in length

im using neither because i am going with 400sbc and th400 shorty in the 82, i just got the 305 and thm200c yanked about 10 mins ago in the gravel, ! fun ! sarcasm !
but its out, yay !
now i can start cleaning and plannign for exhaust