[77newell]

Retro: yes my 77 had been repowered from the 230hp Cummins to the 350hp Detroit. Given that the previous owner liked to drive the mountains, 230hp was inadequate for a 28,000 lb coach plus towed. Another aspect of this is that I don't think he had the rear axle gears changed so the ole Detroit was kept pretty wound up, but it sure would haul up the hills, hills that would slow my 93 with a theoretically better hp/weight ratio.