Can The (+,-) Button Be Used Without The Lever At "M"? - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 01-26-2014, 07:16 PM Thread Starter
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Can The (+,-) Button Be Used Without The Lever At "M"?

I am future buyer of a 6.7 and have a question regarding the operation of the +/- button.

Does the lever have to be selected into "M" (manual mode) in order for the the +/- button to function? For example, say you're approaching a really steep hill and you want a bit more engine braking; can you simply hit the "-" portion of the button and it will downshift or do you have to first put the lever down into "M" and then hit the button? On some vehicles that have the +/- feature it will still allow the operation of that button to an extent without having to put the lever into "M", however of course, the transmission will eventually supersede your choice because it is not truly in manual mode if that makes sense.

As mentioned, I am a future buyer of a 6.7, however, have driven standard transmissions all my life because of it like to still have some control over the shifting points. Especially for grades where a standard can often have a lot more engine braking over an automatic where it feels like you're coasting versus the brakes being applied (manual).

Thanks guys.

Last edited by Austen; 01-26-2014 at 07:33 PM.
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post #2 of 5 Old 01-26-2014, 07:26 PM
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The +/- works in drive. It will drop a gear as soon as the RPMS allow.

While in Drive, your tranny will select any gear below the max shown. So if you + all the way up to 6th. Your tranny may stay in 4th if that is the appropriate gear for the work being asked. So in drive the +/- just limits how gears the tranny has to choose from

When in "M" it acts like a manual tranny and shifts to the selected gear.

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post #3 of 5 Old 01-26-2014, 07:28 PM
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You can use the +/- to lock out a gear when in drive. For instance, when you are driving along and you hit the minus button, it will eliminate (lock out) sixth grear. Hit it again, and you lock out fifth and so on. This is useful when towing to lock out overdrive gears if needed or for passing.

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post #4 of 5 Old 01-26-2014, 07:42 PM Thread Starter
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Awesome,

Thanks for the explanations! I'm glad to hear that it will still operate in drive and you don't always have to stick the lever into M.

While operating the button in drive, is the transmission's response usually pretty immediate for a sensible choice? For example, if the truck is in 4th and you want 3rd for a steep hill approaching (suppose you're cruising on a level road) will the button typically yield an immediate response down to third gear?
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post #5 of 5 Old 01-26-2014, 08:01 PM
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Quote:
Originally Posted by Austen View Post
Awesome,

Thanks for the explanations! I'm glad to hear that it will still operate in drive and you don't always have to stick the lever into M.

While operating the button in drive, is the transmission's response usually pretty immediate for a sensible choice? For example, if the truck is in 4th and you want 3rd for a steep hill approaching (suppose you're cruising on a level road) will the button typically yield an immediate response down to third gear?
Yes (assuming the downshift is within the permissible RPMs). Additionally, Tow-Haul mode will engage an engine break.

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