Great to hear that your 4.4 transmission is still performing fine in your 4.6

I think we probably identified the D-brake (used in 3rd & 5th gears) as the highest risk item (the 4.4 has 4 clutch plates and the 4.6 has 5). Maybe the characteristic of the 4.4 torque converter helps. I guess the solenoids may also adapt, too, to offset any clutch slip.

As you say, the 260mm converter is more likely to overheat the fluid, as that engine was matched to the 280mm unit.





Phil