Saw 250 degrees on the ol' tranny temp gauge today. Think some synthetic goodness may be in order for summertime loads.
It was over 90 ambient, I was doing 70+ in double over for hours, with hills, and probably weigh 24-25k. Pretty much worst case. IIRC Eaton says 230 or cooler is where to be. Currently filled with 75w90 dino juice. I should double check specs and see if I could go to a 50w MTF instead. I'd think a thinner oil would reduce temps too? I may be backwards on that though