I found this chart in an article from carcraft.......

Mopar Automatic Transmission Guide
This list is not conclusive or absolute, but provides general guidelines with respect to power ratings.
Trans Year Small-Block Big-Block Stock Modified
904/998/999 '60 X -- D B
727 '62 X X A A
500 '88 X -- C C
518/618 '90 X -- A A

Note: In place of a vacuum modulator, Chrysler automatic transmissions use a rod or a cable to control throttle pressure and kickdown.

*Ratings: A = High torque, heavy car; B = High torque, light car; C = Low torque, heavy car; D = Low torque, light car

I have a somewhat heavy car with a somewhat high torque engine and I think I am on the edge with this trans holding up....... I think I need some pepto bismol to quiet my gut down TBF