my step can hit about 60-62mph when in second at WOT, so I think you will be safe shifting into 2nd at 40mph, I do it a lot to get on the power since I don't utilize the kickdown feature of the step that much. I don't do it to slow down, only to get more power at a higher rev when I need to pass or whatever.
not changing from 5th to 2nd there is nothign wrong with doing so, as long as the speed descreases with the change in ratio's
i can change form 5th to 1st without any problems just as i can change from 5th to 4th and blow the engine
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