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Open Roads Forum  >  Tow Vehicles

 > Settle this for Sequoia and 4Runner owners...

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Yosemite Sam1

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Posted: 09/24/20 11:21am Link  |  Quote  |  Print  |  Notify Moderator

These vehicles gear hunt even when going uphill and you don't have to manually shift to lower gear if it's losing momentum. All you have to do is depress to the floor the gas pedal to downshift to regain power and desired speed.

It's when going downhill that one needs to manually downshift for the engine brake assist.

BurbMan

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Posted: 09/24/20 11:32am Link  |  Quote  |  Print  |  Notify Moderator

How is this specific to 4Runner and Sequoia? FWIW, it's good a practice to downshift going uphill too...otherwise if you have to lift off the throttle for any reason the transmission will upshift, then when you get back into the throttle it will downshift again. If you select the lower gear it will stay there and your lag time to power is less.


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Yosemite Sam1

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Posted: 09/24/20 11:48am Link  |  Quote  |  Print  |  Notify Moderator

BurbMan wrote:

How is this specific to 4Runner and Sequoia? FWIW, it's good a practice to downshift going uphill too...otherwise if you have to lift off the throttle for any reason the transmission will upshift, then when you get back into the throttle it will downshift again. If you select the lower gear it will stay there and your lag time to power is less.


The debate is on a forum among owners of Toyota Sequoia and 4Runner.

Not sure, nor part of the debate whether other trucks have these features and capabilities -- which are effectively auto and manual shifting modes.

But you do have a point although I assume that the shift to lower gear is just to regain momentum and maintain previous pace or speed (not going any faster for the gear to get to higher gear).

K Charles

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Posted: 09/24/20 11:52am Link  |  Quote  |  Print  |  Notify Moderator

They make automatic transmissions so they will shift automatically. I use mine that way and it does just fine.





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Posted: 09/24/20 12:01pm Link  |  Quote  |  Print  |  Notify Moderator

You may also want to manually downshift before an uphill grade so you are in more of the power band when climbing. The automatic will not downshift until there is sufficient pressure which may be too late.


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Yosemite Sam1

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Posted: 09/24/20 12:06pm Link  |  Quote  |  Print  |  Notify Moderator

Bedlam wrote:

You may also want to manually downshift before an uphill grade so you are in more of the power band when climbing. The automatic will not downshift until there is sufficient pressure which may be too late.


I usually try to gain speed so I'll have that momentum going uphill.

ShinerBock

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Posted: 09/24/20 01:02pm Link  |  Quote  |  Print  |  Notify Moderator

Bedlam wrote:

You may also want to manually downshift before an uphill grade so you are in more of the power band when climbing. The automatic will not downshift until there is sufficient pressure which may be too late.


This is true. I think those that say they they just let it do what it needs to do probably should do more reading on how a auto trans works.

There is a reason why heavy duty truck automatic/automated transmissions rely on GPS coordinates to downshift because the trans computers are not smart enough to know when it is going up a hill. It only knows pressures, throttle input, and rpm. So it generally downshifts after it is too late and needs to use more engine power to regain momentum especially when in cruise control.

enblethen

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Posted: 09/24/20 01:45pm Link  |  Quote  |  Print  |  Notify Moderator

Newer vehicles have a CVT (continuous Variable Transmission). They are more computer controlled via ECMs. They seem to shift quite a bit different then previous automatics.
Yes, they can be manually shifted in most.
Not sure which transmissions are put in Toyotas, but most newer vehicles including large trucks use a form of CVTs.


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BarabooBob

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Posted: 09/24/20 02:00pm Link  |  Quote  |  Print  |  Notify Moderator

I have not seen any full size pickups using CVT's. This is a quote from FLeetowner.com--"After three years of development, Ford Motor Co. engineers are testing a more robust continuously variable transmission (CVT) design in a Ford Expedition SUV, with its standard 215 hp, 4.6-liter V-8 engine. This represents the first time this technology has been applied to a full-size truck. I wonder how they will work with 400 hp?


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memtb

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Posted: 09/24/20 02:20pm Link  |  Quote  |  Print  |  Notify Moderator

Our 2013 4Runner, will downshift on a decent, once your speed exceeds 5 mph over the cruise control set point. Of course....you must have the cruise control activated to enjoy this feature! ?? memtb


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