other than adding a third bottle of friction modifier, i havent done anything yet. i will pull it apart once it is parked for the winter. meanwhile, been watching the tach on my '03 silverado and rpm's are at/just under 10% lower at comparable speeds. other than mileage, is there any disadvantage to running 2500-3000 rpm's for several hours? had a c40 many years ago that turned 5500 rpm's at 50 mph. did that twice a day for an hour and a few 3 hour trips while i owned it. i have more money in my current engine than i paid for that entire truck so it doesnt ever see 5500. is 3000 rpm for an hour straight even a concern or is that where everyone ran before we had overdrive trannys?
