Huh,had no idea there were differences in the 4L30E within the VX model years. I know the various 4L30Es have different guts based on application. I wonder if it would be better to get one out of a trooper (heavier vehicle) The one in mine came out of a late model trooper, had 80+K miles on it. I haven't had a problem since, towed trailer thousands of miles now, never touched the fluid.