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azdryheat

Tucson, AZ

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Posted: 07/29/20 04:09pm Link  |  Quote  |  Print  |  Notify Moderator

I'm always in manual mode in the mountains.


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time2roll

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Posted: 07/29/20 05:11pm Link  |  Quote  |  Print  |  Notify Moderator

I prefer to let the transmission do the downshift. I believe this is better for the transmission with less wear and tear for the driveline. If you just pull the lever sure it will just shift immediately and on my truck it can be a bit harsh at higher rpm and near full throttle. If I let the computer decide then the shift is much smoother.

However once the downshift is made I do tend to pull the lever and hold the gear to the top to avoid unneeded hunting up and down causing more wear.

For a fairly long and steady hill I will often set the cruise to a certain RPM (3500 maybe) and let it run to the top with transmission held.

Ok mine is an old 4 speed. For those with 6, 8, 10 speeds it might be just as easy to set the cruise and let it do its thing in automatic. Just let it run unless it starts to hunt then pull the lever at the next downshift. OK to reduce the CC speed a bit on a longer sustained climb. Don't make a race out of it and you will be fine.


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Edd505

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Posted: 07/29/20 05:33pm Link  |  Quote  |  Print  |  Notify Moderator

garyp4951 wrote:

I never use cruise towing in the mountains, and wonder why some do. I'm in no hurry, and its also hard on the power train.


Not so in the newer diesels with the exhaust brakes. The ECM/TCM will hold the set speed & downshift as necessary & the CM's will not let the motor self destruct. As posted tap the brakes on occasion to slow & hit resume.


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thomas201

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Posted: 07/30/20 06:45am Link  |  Quote  |  Print  |  Notify Moderator

I like cruise and use it a lot. But, it is a dumb robot and it cannot think ahead. On secondary roads, that are twisty turny, that I have driven for years, I know what is coming next. Why let cruise top a mountain at 55, just so I can stand on the brakes for the 25 mph turn on the far side? Those big, long multi mile grades out west, cruise is great. Appropriate Technology for the task at hand. Now, if cruise could be slaved to GPS, and interpolate elevation change, and the customer could do a little programing, yes, then we could almost use it all the time. Might as well get self driving too!!!

mleekamp

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Posted: 07/30/20 08:22am Link  |  Quote  |  Print  |  Notify Moderator

PUt it in TOW MODE (usually on the end of your shift lever)...let the truck do the rest. No Cruise over mountains.

The TOW MODE will do engine/trans braking going down hills, and keeps it out of OD, and keeps gears longer...better towing experience, IMHO, over mountains.


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garyp4951

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Posted: 07/30/20 09:57am Link  |  Quote  |  Print  |  Notify Moderator

Edd505 wrote:

garyp4951 wrote:

I never use cruise towing in the mountains, and wonder why some do. I'm in no hurry, and its also hard on the power train.


Not so in the newer diesels with the exhaust brakes. The ECM/TCM will hold the set speed & downshift as necessary & the CM's will not let the motor self destruct. As posted tap the brakes on occasion to slow & hit resume.


Sorry I should have said going uphill, and I always use tow haul with full exhaust brake.

gtnsmlr

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Posted: 08/01/20 09:20pm Link  |  Quote  |  Print  |  Notify Moderator

Auto pilots can't surf and cruise control can't climb hills...


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Veebyes

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Posted: 08/02/20 05:37am Link  |  Quote  |  Print  |  Notify Moderator

After 35 years of driving nothing but manual shift vehicles I guess that I am set in my ways. I like having control & seldom use cruise control except on light traffic flat highways.

Cruise control can't see a grade coming up ahead & speed up a little to get over it in top gear. Cruise control downshifts to a much lower gear on long downgrades resulting in a screaming engine as it tries to maintain set speed.

I prefer to put it in manual mode & control which gear is used myself for the downgrades. Let it get up to 2600rpm or so, a short burst of heavy braking to knock speed & RPM back down, let it build again, repeat. Shift back to auto tow mode near the bottom of grade.

I imagine the newer trucks are even smarter than my 06 but going uphill a little twitch of the foot will make it downshift sooner than it will on it's own.


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StirCrazy

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Posted: 08/02/20 08:34am Link  |  Quote  |  Print  |  Notify Moderator

I turn on the cruise control when ever I am towing on the highway. in the big mountians I use the tow haul but the rest just normal as all the tow haul in my ford does is hold shift points a little higher, all the other features of speed holding down hills and such work with the tow haul off.

Steve


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Splashers3

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Posted: 08/02/20 09:39am Link  |  Quote  |  Print  |  Notify Moderator

Some of you will get a chuckle out of this, but I NEVER use my truck's cruise control when towing.....NEVER.


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