I know this has been beat to death but still having trouble deciding which is best for my truck. Really hated to start another thread on this but kind of need to figure this one out. I have a 1999...
My 01 had the Dana 70 but did have the tow package with overloads. It was my understanding that manual transmission trucks got the 80 because of the higher tow rating but autos got the 70 that year.