Rattlehead

I have a suspicion that TCC disengagement from heavy accel or braking is not done at all on the M939. I can feel the TCC engage, but have never felt it re-engage after say, braking at moderate speed and then getting back into the throttle. I just don't see how the trans would know you are braking, but total system details are elusive in these manuals.

Here is a screen shot from a MT654 repair manual, for transmission dyno testing. This confirms the TCC lockup in 2nd gear. Also notice that the TCC doesn't disengage because of a decel until vehicle speed decreases.

Attached Images

	MT654 upshift chart.jpg (27.4 KB, 36 views)
	MT654 downshift chart.jpg (27.9 KB, 32 views)