60 is probably the limit, under 3000 RPM, less is better for long periods - remember when the truck was new the roads were narrow and poor with a lot of 45mph speed limits
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
