I have one of these behind a 235 in my 55.1 3100. I'm using the governor to control the solenoid. I'm so pleased with how well it works, I didn't even put in a switch to turn it off. I'm not using a kickdown at all. The benefits didn't seem to outweigh the additional complexity and fabrication effort. The rear end is a 3.90 and there is sufficient torque at 2000 RPM to provide adequate acceleration for passing on multi-lane highways. I don't drive much on 2-lane roads where I have to pass quickly, so I can't say whether or not it would work well there. The few times I've needed to, I just downshifted to 2nd with the OD still engaged. That seems to be a slightly lower ratio than 3rd without OD.
regards,
Leon
