Rebuild 904 or swap for 727?

Old thread I know. But the actual amount of "parasitic drag" in a 727 amounts to less than 1/4 second in the quarter mile. The reason people believe the bigger transmissions have so much drag (chevy, ford, mopar) is because when the 904 is swapped out for a 727, the original 727 converter is used, and it usually has a lower stall. Then they don't have the kickdown set up and adjusted properly (thinking they'll just shift it manually) but it shifts too soft and the shifts are longer without the kd right. And good luck finding somebody who can do a performance build on a 904; much less any automatic. They throw a kit in it and call it good. And don't get me started on these "performance" trannys for $2k and up; most only have four direct frictions. Chock full of their own trick (expensive) specialty parts. The weak point on ALL the old three speed automatics is third gear.