I can kind of answer this one: not great..or at least as great as the 400 in my opinion. With quicker RPM climb that shift window is shortened leading you to do some "racing" between the two. The 7155 has a minimum sustained RPM before the clutch disengages by itself to prevent damage and it's not a fast transmission anyway so you'd have to be more precise with timing and still be limited by the show shifting.I'm fascinated by the 7155... It's one of the reasons I've been looking to replace my current tractor with a M920. I have a 7155 question: How do you think it would behave behind a completely different engine than the Cummins 400? Let's say the Detroit 8V92TA from a HEMTT at 445 hp. Horsepower is similar, but the Detroit RPMs rise and fall more 'snappy' and it would have different torque characteristics. Would it still shift fine? Maybe the Cat's valve body would need to be tuned/recalibrated?