xTHANATOPSISx,
Yes, these are 600 & 660 lbft gearboxes but the game doesn't care about the torque loads and they have an interesting selector pattern. Not everything needs to be all about role-play :).

The first update will include support for Harven's Mack R6, which is right up this box's alley.

Did a little research and, if I've got things right, these are more geared towards medium-duty trucks with lower power engines (600lbft and under). 1970s and maybe '80s? Stuff like the International Loadstar or larger F series Fords and similar. Either way, neat gearboxes. It'd be nice to have some more trucks that are "correct" to use with them.

Awesome!