Driving tips - newbie here

Going uphill, I would let the transmission do its job and leave it alone

Too high does not explain what the RPM actually are when climbing hills.

TOW HAUL can be used all time if needed to keep the transmission from shifting in and out so much such in foothills where it downshifts and upshifts with each grade. It will not hurt the transmission.

The transmission will help to brake speed downhill in the mountains and if the RPM get too high 4,000-5,000 for a length of time them brake hard to slow the vehicle and drop the RPMs. It may actually shift up a gear allowing speed to increase. If needed to shift down hit the brakes a couple times to check the speed and the transmission will downshift again.

4,000-5,000 RPM will not hurt the vehicle for short periods of time, like climbing steep grades or descending steep grades. The V-10 develops its max HP at 4,800 RPM.

It is frightening that we are sold large heavy road equipment that contains systems for safe driving on grades and we are not educated in how to use them. Of course that assumes that the salesman or delivery individual actually knew how to use the equipment. Lack of knowledge about descending steep grades will kill RVers and innocent victims in their path. It happens! Shifting up to "protect the engine" could result in loss of control of the vehicle unless brakes are firmly applied and then what happens to the brakes. They fade away.

Tow/Haul Ford and Grade Brake GM both provide a margin of safety initiating the downshift that a knowledgeable driver could take on his/her own. Understanding that the higher revs are helpful and that the tach is the source of information about engine speed and not hearing alone is vital. My old 8.1 L would howl all the way up a long grade at 4,500 RPM in 1st or second and just say thanks for the exercise at the crest. I must not have been to bad as it was still running smoothly when I sold it with over 105,000 miles on it. Likewise on long descents the Allison would never let the engine over rev it just upshifted and then I had to hit the brakes to get under my target speed and start the cycle over.

They don't teach you this when they hand you the keys and say have great day. They ought to.

Rant mode off

cgmartine wrote:
It has been a few months since this thread started, but I would like to join in and ask a question. I also have a Ford V-10 Triton, Class C. Going up any slight grade, the motorhome slows down considerably. If I drop it into 3rd gear, the engine revs too high.revs too high. Can I use the tow/haul button to help it go up those hills, or is it mainly used for going down hills? Thanks.

What were the RPM when it rev'ed too high? It was probably just fine for the V10.

Tow/Haul mode came out in the late 2000 on many gas vehicles. It changes the tranny shift points and when the torque converter kicks in. Unlike the OD feature of the past this is computer controlled. Awesome feature to have.

Tow Haul mode does act like a engine brake when going down hill. I prefer to leave it on and just use the brakes occasionally to slow the RV down. If you don't like the high RPM's turn tow haul off and plan on using your brakes more (which can reduce there life and warp rotors).

If you are on a hilly road, tow a car, heavy winds or just fully loaded I would also run the tow haul mode as it will let the engine rev a little higher in gear which is good in those conditions. Light load and tail wind you may not want it on.

Maladjusted wrote:
I am a newbie with a 40' DP!

nevermind Fire... I jumped right into the blast furnace!!

Mal

Way to go! You must have read that advice to buy your last rv first. Enjoy
Fred

Whatever the transmission control computer does is fine. If you're used to the older low-revving engines, the V-10 is a bit of a surprise. I switched from a 1985 Class C with the old 460 to a 2002 Class A with the V-10. Fortunately. I have a motorcycle background (worked for Norton-Villiers before we emigrated), so high revs are not unusual to me.

I remember a 50-cc Isle of Man TT bike from Honda that developed its peak torque at 15,000 rpm and max power at around 23,000. It had a 16-speed transmission! I figured the rider had the clutch pulled to shift gears about 15% of the time.

The V-10 is a fairly high-tech, high rpm engine by US standards. If the various control computers are allowed to do their thing, they won't let the engine get damaged. Just let them run things and don't try to second guess them and use manual shifting. Ford engineers (a couple of whom I know) did an awful lot of work to get those computers to consider every possible scenario and respond appropriately.

Don't worry about it until it gets over 6000 rpm. Don't know about the current versions, but the older 2V would go to 5800 at full throttle before any cutouts started applying.

The Allison transmission can do that downshift thing to assist with engine braking, I do not know of Tow/Haul will do it but Grade Brake does and it may be they mis-labeled the switch (it only has two modes. which two is determined by the programmer when its factory programmed).

This, saves wear and tear on the brakes, and is thus a good thing.

To shift back up.. Tap accelerator.

I had the impression that the transmission in the V-10/F-53 rigs was a Ford-made unit, not an Allison.