I have a 97 180H. P. 4x4 2500 which we use to pull a 11000 LB. r. v.
When the ambient temps get above 60 degrees the EGT quickly gets out of control pulling up grades, on long pulls the coolant temp will follow and we can end up in second gear at 30 M. P. H. to keep the egt under 1200 degrees...