Do you have any problems with the cruise kicking out on you on a hill that slows you down? I know some cruises have a tolerance of only 5-10mph and will "cancel" if that's exceeded from what speed is set. Hope that makes sense
I've had quite the opposite happen. Once the load exceeds the ability of a wide open accelerator, the tranny shifts down into the next lower gear and even into low on a really steep grade. RPM's go from next to nothing to red line in a heart beat and threaten to take the engine out before I can take the thing out of cruise. This has happened in my Crown Vic, Chevy S10, GMC Sonoma and even my Isuzu turbo powered Skoolie. Now I just automatically turn off cruise before I reach even a moderate grade.
That's where I usually like the cruise, hit a long hill, lock the cruise on and let the governor restrict the diesel back and it climbs the hill safely and at full throttle allowed. On a diesel engine that is....