Convert to 454???
 

Hi,
I have a 69 Chevell SS (my dream car) that needs the 454 and a 400TB put in. The motor mounts are still attached to the motor. My husband says he would put rocker mounts on it instead. I guess my question is what is the easiest way to put this motor in?
Also, will I need to change the driveshaft? We think it had a turbo 350 before.
Thank you for your time!!
Valentine

Hi Valentine. It is nice to see another female car lover here. Welcome !

Im with Ms Grumpy ,welcome to another Lady Carnut as my wife calls herself . Ive never heard of rocker mounts before .

Welcome and yes the TH350 is a different yoke than the TH400. The TH400 has a larger diameter and more splines on the output shaft. I just converted from a TH375 to a TH400 and needed a new driveshaft made up.

I responded to your PM...

The existing driveshaft can be shortened and the TH400 slip yoke installed on it. Hopefully you have a passenger tranny and not one from a truck/van. Those truck TH400 have a bolt in yoke although there is a way to work around that when installing in a passenger vehicle.
I've done this tranny upgrade swaps numerous times...

Bill knows these old cars pretty good ,he changes motors as often as some of us buy new underwear .