What would be needed and involved in putting a chevy 400 auto behind a cummins? Can it be done if I use a bell from a cummins with the chevy sm465? What about flexplate? Can the 400 be built to handle the cummins if used in drag racing? Thanks SS

 

Yes. You can mate a 6BT to a th400. Advance Adapters sells the setup for about $1700.00.

 

Why bother? The old 727 is by far superior to the 400. And with either you only have three gears. The 727 came behind some of the early Cummins/Dodge trucks.

 

If you want to use the T400, make sure you use aftermarket shafts.
There was a story a few years ago when some one did this, they kept breaking shafts.
Eventually put the dodge trans in it.
I like the T400, it has its advantages, but needs to be beafed to hold this motor.

 

If you are intent on doing this, find a TH475 package from usually a camper. Has a lot of heavier parts. Be a lot cheaper to just go with a 727 with the hemi stuff in it. Steel caged four gear planateries, five clutch third and 2 1/2' band, either single wrap or double wrap. I still have a five clutch drum and band here from drag race days. You would need a billet converter shaft and a custom converter to do it right.