There are some great tips that have been presented so far. I like the one telling to put on the air and lights to load the engine, as every little bit can help. I am not impressed by the 50-60mph descents when you have clearly stated the need to obey 25mph warnings.
Getting use to the “M” mode is very important. And also knowing beforehand what gear will give you what speed at a given rpm. Meaning if you would rather not go over 3,700rpm (as a guess) you should have an idea what the speed would be in different gears. As different gear selections will need to be made on the fly as conditions change.
You could get an idea of what that would be on a level road by using manual and taking each gear up to that rpm and recording what the speed is. Let off and shift to the next gear and repeat. This would give you an idea of what gear would match your preferred rpm range and speed desired for maximum engine braking. And the rest would require the foot braking as has been clearly stated.
Going down a little slower is much better then over speed. Cause remember they always seem to put a stop sign at the bottom of them hills!
My truck does not have a manual shift mode...shifter shows "PRND321" do i just have to slow down to the desired speed and then use cruise control to allow the truck to downshift from 4 to 3 and etc... or do I need to manually downshift to 3rd...
If so how can i do that while driving or do i have to come to a stop...shift from "D" to "3" and etc...
Thanks! Happy Memorial Day!
2017 Wildwood 31KQBTS
2010 F-150 Platinum 5.4L/3.73 Full Tow Pkg.
Nights Camped 2016 "30"
No, you don't have to stop to shift from drive to 3rd. I wouldn't try it at 65 mph, as a test do it 45 mph. 3,2 and 1 are all available to manually shift to. I have the same shift options and would slow way down and put it in 1 at the top of that hill. After leveling out at the bottom you can pick up a little speed and shift to 2nd, pick up some speed and shift to 3rd, then to drive. I have only had to do this a couple of times in all my travels, as my tow/haul downshifts usually suffice. A grade this extreme is pretty rare.
I live in Colorado and have seen several accidents due to overheated brakes.
Some easy tips that I use to keep things safe:
a. Tow haul switch on
b. Exhaust brake if equipped
c. Downshift 1-2 gears to increase engine braking
Increase engine load by:
a. A/C on even if it isn't hot on. This puts an 8-10 hp drag on engine
b. Increase electrical load on engine. The increased electrical load puts a load on the engine via alternator. I turn on all lights (parking, front, and fog), rear defroster, and even put the tush warmers on.
d. MOST IMPORTANT ***SNUB BRAKE**: Do not ride your brakes the entire way! This will cause them to overheat! Pick a comfortable speed and apply brakes when speed increases to 5mph faster than your desired speed and then apply brakes to about 5mph slower than set speed. Let go of brakes and repeat. With a/c on, car in lower gear, and high electrical load, you won't be speeding up as fast as you did before.
Lots of commercial drivers think that constant braking is the proper way to ride down a mountain. These keep the runaway hill maintainers employed. Constant braking is a myth especially when towing.
A good example of snub braking except I go 10 mph (5 above and snut to 5 below)
This is what I do when I'm coming down a steep mountain, I set the cruise at the speed at what I want to come down safely, then I put the truck in tow/haul with the engine brake on. When I get to the bottom I'm going at the speed I set the cruise at and I have never touched the brake. I now have a 2012 Silverado 3500HD SWR. I had a 2500 2008 Silverado that I did the same way minus the engine brake setting. I believe with the Allison transmission and the Dmax I could fall off a cliff and when I hit bottom I would still be going no faster than what I have the cruise set at.
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X2 but I do this with my Ram 2500 6.7 Cummins.
Select tow/haul, auto engine brake, and cruise set to 62 or speed limit if lower... Truck will not go over said regardless of grade...
2016 FR Vengeance 25V Toy Hauler
2015 Ram 2500HD CC 4x4 6.7L Cummins
2004 Kawasaki Vulcan 2000
2005 Troy Built 3500/5250 Genny
I have hauled several mountain routes and 9%-14% grades on the Blue Ridge Parkway which is where we are right now.
I turn on the tow/haul mode, activate the exhaust brake and set the cruise control and let the Allison tranny figure it out. Never had a problem with speed or temps. TT is 9,500 lbs and TV is a Silverado 2500 HD with super springs added.
2013 Silverado 2500 HD Duramax/Allison Tuned
Aviator Wright Flyer #1919
"First In, Last Out". 11B4Y
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