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Paul1944's avatar
Paul1944
Explorer
Aug 09, 2017

Risk of down-shifting?

I have a 2004 Coachmen Sportscoach with a 330hp CAT, and 6-speed Allison transmission. Here is my question. Do I risk damaging my transmission if I down-shift in order to slowdown or to save on my brakes when going down a long and/or steep grade? In reading through all my manuals I cannot determine if my coach is equipped with a jake brake.
Seeking Advice
  • jim1521's avatar
    jim1521
    Explorer
    Aug 09, 2017
    Most transmissions will protect themselves, so you'll need to use both brakes and transmission. Get RPMs down to the lowest gear that will allow control, then use brakes to help drop RPMs. Don't ride the brakes (or do your best not to). Work your way down until you get to your desirable speed. Use lower gears as much as possible.
  • 12th_Man_Fan's avatar
    12th_Man_Fan
    Explorer
    Aug 09, 2017
    The Allison transmissions I am familiar with will not allow you to downshift if the RPMS are too high. It has it's own computer to prevent damage.

    If you try to downshift at too high RPms the tranny will not shift.

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