Torque converter
You run an 8 inch?What stall?I run a Coan 8 inch 4500 stall,footbraking at 2200rpm my 60fts average 1.44-1.50 with tire pressure at 10psi.You might be best to pull your convertor and take it in to see exactly what you have.When ordering mine I gave cam specs,gear and tire size to match up the convertor.Good Luck.