swapping a 904 for a 727 info please!

[moparmadd077]

i have an opportunity to pick up a build 727 for my 70 cuda. the car currently has the original 904 in it. my question is, what will I need for parts to make the change? is the driveshaft the same? tranny mount? shifting linkage? I am putting the trans behind a 6.1 hemi. I heard 904 are plenty strong but it will cost me more to build it then it would to buy a build 727 and the torque converters are generally cheaper. It would be nice to have both trans as an option. any info or comments regarding the swap are welcome. 

[1 Wild R/T]

Driveshaft is definitely different, length & Yoke...  Shift linkage is different but I've heard of guys making it work.... Kickdown linkage doesn't matter, you'll be modifying anyway... Dipstick & tube are different.... Mount is the same... Cooler lines are the same...

[moparmadd077]

okay thanks. im putting a bigger rear end in anyway so I will have to find another drive shaft. going to put in a 8-3/4. it has a 7-1/4 now.

[1 Wild R/T]

Driveshaft wise I typically find a shaft out of a C body donor so it has the big yoke, big u joints & is to long.... Take that to a driveshaft shop with the length it needs to be & they can cut & balance it for you...

[Katfish]

If you're going to a Gen3 hemi, I'd be thinking about an OD tranny instead of the 727.