Gearing/info seeking

[Lonestar10]

I would die in his truck the t600 is built so poorly compared to my glorified longnose prostar. Im 6.2 and I can barely move in the 600 and 660 series vs be able to salsa dance in the prostar cab. But I've rode with him he drives harder than I and uses cruise running faster always In top gear. As far as wear engine had 1.2 or 1.3 mil at overhaul and only thing found was a bit of copper showing on cam bearings. His Truck still ran great just thought it was time for a refresh. Only problem his truck has is staying below 200 in summer month before and after overhaul.