Guys,
Certainly don't want to start a big fuss, and I don't know what torque number it takes to maintain speed in my car in 6th gear. All I can verify is what I know to be true from what I have experienced in my own car for over 30,000 miles since September, 2007.
I have no idea what the torque number is on my Roush 427 SRTW #444 at 2,000 RPM, but I know it is enough for smooth operation at 2,000 RPM with the Tremec T56 in 6th gear with 3.89 rear gears and 25.5 inch tall rear tires.
The car cruises smoothly at 2,000 RPM in 6th gear and has no problem at all maintaining speed in 6th gear at that RPM.
I have had zero problems with the Tremec T-56 transmission and the valve covers and
oil pan have never been removed from the engine.
If any of my combination breaks tomorrow, I will be happy with my past service and performance and would gladly replace whatever breaks with the same parts without hesitation.
Jody