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M939 transmission problem: engine dies when I hit brakes
Do you feel the torque converter locking up in 2nd gear when you are running it? Does it downshift out of the lockup? Should be a 250/300rpm drop/raise with the lockup shift point. It locks up in 2nd gear before the 3rd shift. There is a piston inside the transmission that controls the...- simp5782
- Post #9
- Forum: M939 series 5 ton trucks
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M939 transmission problem: engine dies when I hit brakes
No. It is not an electronic lockup. The button on your transfer case handle puts the transmission into 5th gear for ease of shifting. Does nothing with the torque converter. M939 trucks prior to ABS would cause stalling during braking...- simp5782
- Post #7
- Forum: M939 series 5 ton trucks
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M939 transmission problem: engine dies when I hit brakes
Check the fuse right behind the light to make sure it's not blown. Your pcb shorting out might have fried the ABS module though. This was the reason for putting abs on the trucks was for a stall while hard braking. A malfunctioning treadle or relay valve can alsp throw the light on. I think...- simp5782
- Post #5
- Forum: M939 series 5 ton trucks
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M939 transmission problem: engine dies when I hit brakes
Shift to neutral when coming to a stop see if it continues doing it. Is your abs light on?- simp5782
- Post #3
- Forum: M939 series 5 ton trucks