904 or 727 ?

fishy68 said
Ok guys what about the converter issue with a 904? You know I'm not a 904 basher at all, in fact I promote them a lot, but when you start throwing a lot of torque and hp at them I've seen a lot of 904 TC's with cracked necks unless their a billet converter that costs 300-400 hundred bucks more. That puts a hurt on the build price. And how many drums have you guys actually seen blow in a 500 hp street driven 727? I have not even seen one. Yes, if it's a race car with no low band apply you definetly need a good drum but I'm not so sure about a 500 hp street car.

I have crunched the #'s of building a 904 vs. a 727 and the 727 always comes out cheaper by about $300. Now if the car already had a 904, changing to a 727 would necessitate a new driveshaft that would eliminate the diff. in build price and possibly even put it higher than a 904 so I'd stay with a 904 in that case.

And as for the claims that a 904 is a whole bunch faster than a 727 I'd like to see proof. Faster yes I agree their faster. A whole bunch faster I really doubt. And if it's not a race car why does a tenth or even 2 tenths matter that much? I have a buddy that has a mid 10 sec. 67 Cuda and he smoked his 904 mid season and didn't have the money to do it up good and put in a 727 that he borrowed and raced the season out. There was right at .1 difference between the 2. In a heads up track race it's important, but in a street car... JMHO :toothy10:

I ran a 904 for 5 years in my Dart it ran high tens in a 3440 pounds street car. I had a 450 hp small block with a 200hp N2O kit on it pushing the button right out of the hole. It held up just fine. I did break the snout of the converter once and it was due to my bell housing not being perfectly aligned. Pro Trans in Lancaster Ca has done my transmissions for years and his expertise is second to none. His prices are exceptionally resonable as well.

The 904 is much smaller externally than a 727 as well.

The 904 is much cheaper than the 727 to build in my experience. I dont have proof other than first hand experience in 2 cars I have personally owned that have done extensive track time. My small block Dart picked up .4 and just over 4 mph and my big block Raod Runner with a stock 383 picked up .5 and 4 mph if my memory serves me. Both cars were consistent cars that had the transmissions and restested the next weekend.