why are dodge transmissions labeled as crap(no offence)

Yes the converter is a weak link on the diesels. There are few aftermarket companies that sell converters that will last. We get into some problems here because of the intense heat of Arizona. Heat kills tranny's! The aftermarket converters that I've seen have a band around the outside of the converter that looks like armour plating. Very strong, and very pricey; close to a grand. Highly recommended if you're towing heavy loads. As far as the 727's, they are bulletproof. They will stand up to anything you'll likely throw at it. I've seen a 904 behind a 600+ hp small block that was properly built take it all day long. Trans was in the car for 5 years that I know of. But, you have to know how to build and modify the 904 to make it last. It's more expensive to build as I understand. The reason the 904 is popular with some is that it has less reciprocating weight (as I understand it) and is anywhere from .2 to .5 faster in the 1/4. For the average joe build a 727 with good parts and it will be forever true.