Service intervals...will they increase
New automatic for class 8 , heavy duty trucks called the Eaton Endurant. I was reading that he oil drain intervals have been stretched out to 750,000 miles for this transmission. I'm impressed. I...
Forum Discussion
ShinerBock wrote:
Not any more. The Ford 6R140 is also used in class 6-8 F670/F750 trucks. Most people think that just because the F750 has a 7 in it then it is a class 7 only. However, some variants of the F750 have GVWR's above 33,001 lbs which makes them a class 8 heavy duty truck. Technically it is the only automatic transmission used in light, medium, and heavy duty trucks. Allison makes transmissions for each class, but they are different.
Well, technically you are right, but the 6R140 is not used in "real" heavy duty trucks with 1800 ft./lbs of torque and combined weights of 100,000 pounds or more. Class 8 is 33000 lbs and up, but there is a huge spread of specs and capability within that class, and the Ford is at the lower end of that class 8 spread. Having said that, the fact that the same trans as used in HD Ford pickups will stand up to usage in a 37K GVWR truck is very impressive.
