I've got a 1998 Dodge Ram 2500 4x4 with the V10 and an automatic transmission. I perform regular preventive maintenance and she's got 145,000 miles. Driving in OD between 55 and 80 mph, sometimes the tach jumps up 200-300rpm with a corresponding rise in engine noise. I never get a Check Engine Light. The truck doesn't surge but sometimes runs a little rough when it happens. Flooring it makes it go away until the next intermittent time it chooses to come back. Dropping it into D and/or tapping the brake pedal(to unlock the torque converter) doesn't change anything. It is NOT dependent on load or climbing a hill. I've added fuel injector cleaner, cleaned the throttle body, changed the plugs, and kept up with all the tranny fluid changes and band adjustments. It has had this problem for 20,000 miles. It may go two tankfuls between occurences. I'm stumped- anyone had this same thing? What's the fix?