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Old 03-08-2016, 10:28 AM   #11
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I definitely down shift going up steep inclines as the transmission is a bit too optimistic on how long to stay in top gear. When descending I downshift if it feels like I need to or it is a steep grade. If there is a sign warning trucks about a grade and to down shift I generally follow the advise...
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Old 03-08-2016, 09:20 PM   #12
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Shift up or down depending grade. Recommended in operators manual.
Absolutely X 2
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Old 03-09-2016, 01:28 AM   #13
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Seems the cruise control will downshift for you to control speed down hills. But I haven't tried it on any large hills or mountains yet.




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Old 03-10-2016, 02:01 AM   #14
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As the AT will downshift when it needs for the most part, one of the main reasons for downshifting manually when going up hills is to stop gear "hunting" whereby the AT downshifts, brings you back to speed then upshifts, then you slow down with loss of engine power and it downshifts, and on and on. In addition to being quite annoying, this can overheat and damage the AT. Downshifting manually puts it where it needs to be and keeps it there for the duration. You then set and control the speed and keep it right there.


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Old 03-10-2016, 02:10 AM   #15
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A very good article on this topic:

https://www.fmca.com/motorhome/motor...-the-work.html


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Old 03-10-2016, 11:35 AM   #16
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Good article. Always scared of running the R's that high but it makes sense
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Old 03-15-2016, 10:25 PM   #17
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Good article. Always scared of running the R's that high but it makes sense
Anyone have an opinion on how many revs are too many for the MBS engine?

(Need I even ask if anyone has an opinion?!)
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Old 03-15-2016, 10:59 PM   #18
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Also, engine braking prolongs the life of brake pads and rotors.
As long as it doesn't over rev the engine. Brake pads & rotors are cheaper than rods, brgs & crankshafts. I limit my old Chevy to 3600 rpm up hill and down hill I use the brakes intermittently.
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Old 03-16-2016, 04:39 PM   #19
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Anyone have an opinion on how many revs are too many for the MBS engine?

(Need I even ask if anyone has an opinion?!)
I remember reading somewhere (don't ask where) that the computer will not let you over rev the engine.
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Old 03-16-2016, 04:55 PM   #20
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I remember reading somewhere (don't ask where) that the computer will not let you over rev the engine.
Interesting. I can see how it would do it uphill (throttle limit), but now sure how it would do it downhill when it's driven by gravity - unless it disconnects the tranny. Well, maybe it just upshifts (duh!) and you are on your own with the brakes at that point until you bring it back down to a reasonable speed (which is what one should be doing anyway).
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