I like 727's better as they are stronger, but 904's are good also...
I had one in my 68 Barracuda that I drove to 500,000 miles with only one rebuild on the trans... I had my trans guy in Detroit build it heavy duty... He did good work, however is gone now, so I need to find another good trans guy...
I'm not happy with the work that I've seen from John Cope in Indiana... I may have to try the 727 specialist in Indiana...
Or my head guy in Detroit knows a guy near him that did a good job on the 72 year 727 in Eddie's Dart, but Eddie found a 69 year trans and had John Cope rebuild it... It doesn't shift as good as the one my head guy in Detroit had done for us... John Cope has had two chances to get the 69 trans right, and it still doesn't shift right... I told Eddie to put the 72 yer trans back in... Who cares about the year of the trans in the car as long as it shifts good...