Recent content by mjkruid

  1. M

    RPM Concern

    You hit the nail on the head with my exact concern. Wearing the internal parts faster over a shorter period of time. I would say that 80% of its miles will be spent between 2500 and 3000 rpm. We make three or four trips a year that are over 2000 mile runs. I am at 27k miles now and I don't ever...
  2. M

    RPM Concern

    I've done the calculations and from what I can find I would come down from 2500 rpm to around 2200 rpm at 70 mph. I am thinking an improvement of 2 mpg. With todays fuel prices it would take between 75 and 100k miles to pay. (I do plan to keep it that long) My biggest concern was weather I was...
  3. M

    RPM Concern

    Redline on the 6.7 is 4000 also. Just seems to me like it is screaming. The motor home is only 27'. Its basically the same as a large truck camper on an f550. I'm seriously considering the change to 4.30 gears.
  4. M

    RPM Concern

    I have a 2016 27' Class C motor home on an F550 chassis with 6.7L diesel. The rear axel ratio is 4.88. My question is. I run 2500 rpm at 70 mph. On long interstate runs am I harming the engine by running 2500 to 3000 rpm all day? It seem to me that I am revving the engine very high. I am...

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