Tranny cooler question
I talked to my mechanic a while back about adding a tranny cooler. He looked at my truck and said I already had a heavy duty cooler installed. On one trip with a long up hill pull, I saw the tranny te...
Forum Discussion
carringb wrote:ScottG wrote:
220 in of itself is not too high
I would consider that too high for the 4R100 considering the outside air temp.
Mine typically maxes out about 120F higher than outside temp, and only after LONG hard climbs (like 15% grades for several miles). Even pulling moderate grades like Cabbage Hill or Siskiyou summit, mine might hit 200F on a hot day.
The 4R100 behind the 7.3L certainly can benefit from better transmission cooling, but temps like on a cool day would be a red-flag to me that the transmission (probably torque converter) is already slipping generating excessive heat.
I see the same temps in mine with the 7.3L PSD and another thing that can cause excessive temps is a sticking bypass tube on the side of the tranny which if not fixed will destroy your tranny. I had one go bad in less than 50K miles and 9 years.
Larry
