A/T 4th gear in Drive range won't engage

**miked** · September 10th, 2012 11:03 PM

from my seat of the pants rpm shift points etcetera, there are only 3 shift points.

AISIN WARNER A/T 0372L (hydraulic version). 1986 mighty max/dodge ram 50 2wd

**t2erns** · September 11th, 2012 11:28 AM

what gear is missing?

**jick.cejoco** · September 12th, 2012 08:30 AM

Originally Posted by miked

from my seat of the pants rpm shift points etcetera, there are only 3 shift points.

AISIN WARNER A/T 0372L (hydraulic version). 1986 mighty max/dodge ram 50 2wd

once the shifter is engaged, one gear is already on, then there will only be three shift points to get to fourth gear. your transmission might be partly electronic, if it is, there are three enable criteria required to get to overdrive: vehicle speed, coolant temperature sensor (indicating operating temp of 180-210'F) and throttle sensor input of about 20% opening, then, it should shift to O/D

**miked** · September 14th, 2012 05:23 PM

Originally Posted by jick.cejoco

once the shifter is engaged, one gear is already on, then there will only be three shift points to get to fourth gear. your transmission might be partly electronic, if it is, there are three enable criteria required to get to overdrive: vehicle speed, coolant temperature sensor (indicating operating temp of 180-210'F) and throttle sensor input of about 20% opening, then, it should shift to O/D

my bad....i was thinking of 2 shift points. A/T shifts 2 times up to 80 kmh. hard to get past 80kmh. the engine originally was a gasoline (G54B). it was converted to diesel (4d56T)a decade ago according to the paper trail. afaik, it shifts smootly before with 3 shift points. it never did shift to overdrive