[Ford Assassin]

A 13 sec quarter mile time for a street/daily driver square is hauling the mail no matter what, especially since our trucks are about as aerodynamic as a flying brick.

If you want to find out where the converter is stalling/flashing, go see your tuner buddy again and take a drive. While cruising about 25 mph, have him 'hold' the trans in 3rd gear with the tuning software then stomp the gas for a second. Whatever your RPM was when you stomped it is your stall RPM.

I am sure you mentioned it somewhere in the past 38 pages, but what rear gears are you running? Have you weighed the truck since completing the swap?

Gear ratios are often overlooked when it comes to converter stall. Weight is also a factor. The heavier the car/truck, the higher the converter will stall vs the same converter in a lighter car/truck. Same goes with gearing, the lower the gear (higher number) the lower the converter will stall due to load.

A good example is a buddy with a '70's Camaro, has a warmed over 383. Bought a 3,000 stall converter and it would flash to 3,500 with 3.55 gears. Later he swapped to 4.56's and now the converter barely flashes to 2500-2700.