Use the 727 and go slower so what I got sick of the 904s coming apart under power from Mild 360 in a pig heavy car There is a .15 diff in times I can tell you that but 22 years on a 727 and still runs like crazy. Normal maintenance and ATF 4 Mopar fluid. The 904s were good for 800 miles and 5 to 10 passes and then broken to point of nothing salvageable except valve body