Mopar 904 trans pressure

[ss3011]

The way it works is there is some amount of spline lock inside the conveter , If the converter balloons then it forces against the flexplate , which is actually designed to flex slightly . If it can't , or if the converter pilot bottoms in the crank , then the forces go way up and could fail the thrust bearing . If there is enough endplay in the converter then even with spline lock there is enough clearance to cover up some small amount of ballooning . Many aftermarket flexplates are super stiff so they don't flex much , so with those flexplates it is critical to have enough pull up . Usually .090" is enough to be safe .