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Old 07-30-2018, 03:06 PM   #41
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As you are approaching a downhill grade, many times you will see a sign stating the length and grade (6%, 8%). You may also see a Truck speed limit sign. Before you get to the start of the down hill grade you should be doing the truck speed limit, use your engine brake and foot brake when needed to keep the speed in check, keep the speed at or near the truck speed, you will get down with ease.

I have 40+ yrs trucking, have had gross weights as hi as 250K lbs down
many grades.
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Old 07-30-2018, 05:53 PM   #42
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I tow a 30’ classic with slideout with an F250 diesel. Exhaust brake works very well, seldom have to use brakes.

Hey loft47, care to join the Slide Out Society?http://http://www.airforums.com/foru...ry-159166.html

Price is right.

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Old 07-30-2018, 08:44 PM   #43
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17 Ram , 6.7....down hill in same gear as up hill mostly...exhaust brake is on...very seldom touch the brakes...
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Old 07-30-2018, 11:48 PM   #44
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Does anyone have any information or thoughts on new 1500 GMC crewcab 4x4 with 6.2/ 10 spd trans. for towing 27FB out west and in mountains? Have 2015 1500 with 5.3/6 spd tow package but not Max tow and dont think motor/trans/brakes have quite enough reserve for temperatures and hill climbing/desent. Like GMC drivability and they sit lower to ground than others. And would go diesel only if this combo doesnt get job done.
Just another opinion on your TV issue. I have a GMC 1500 4x4, short box, short cab and 5.3l engine that I have used to tow my 25 ft Airstream. It was not a confidence inspiring experience. I have since purchased a Chevy 2500HD Duramax/Allison, 4x4 Crew Cab and I am much happier towing with heaver truck. It is probably overkill for the trailer weight, but the payload is only a little over 2000 lbs, so if you plan to carry anything more than you and a full tank of fuel, you may want to consider a 2500 size truck. Payload is reduced by the weight of 4x4, crew cab, Diesel engine, fuel, tongue weight of trailer, hitch parts and anything you may want to carry in the bed of the truck, like generator, bicycles, motorcycle, bbq grill or many other personal desires. Check out the door sticker on any truck you consider for the payload and know the weight of what you will want to carry and the weight of necessary towing equipment. Don't forget to add in the fuel weight. 'Plan ahead' is the best advice I can give.

Happy trailering
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Old 07-31-2018, 08:28 AM   #45
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There is no such thing out there. You can downshift and let the engine rev up but without adding in braking you will blow your engine eventualy.
Hi

The same cruise control driven braking that "does it's thing" on a diesel also now functions on gas engine trucks. The load on the transmission and engine are no greater than in any other normal use (like going up the hill in the first place ...).

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Old 07-31-2018, 09:10 AM   #46
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Sonora Pass

Check out: https://en.wikipedia.org/wiki/Sonora_Pass

We took our 1999 Chevy Silverado (gas) and 23D up and down that pass. up to 26% grades - yes - 26% grades. Felt a bit intense at times but both the TV and TT did fine. It was a cooler day, actually serious tiny hail at the pass, so that helped cool the brakes.

I always use the TT brakes to take me down to a speed in which I can then downshift the TV and let it handle the load.

You guys and your big diesels (read tongue-in-cheek joke here). Once day I'll get a diesel, but not until my truck gives up. Greenest truck is the one you have.

P.S. TV is 6-liter Vortec engine with 165K miles.

Thanks all for a fun thread!
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Old 07-31-2018, 09:43 AM   #47
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I've been up to 10% grades. They require your attention, but not scary. I can't even imagine 26% grade.


Braking or climbing power aside, are you able to maintain sight of the roadway when climbing at 26% or do you just see the sky and pray?
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Old 07-31-2018, 10:39 AM   #48
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Not true. While there is no such thing as a separate engine brake on a gasoline engine, there definitely is a function known as engine braking. It is simply using the retarding force of the engine (developed by pumping losses in the intake system of the engine) to slow vehicle speed. Blowing up one's engine would be due to revving up over redline. That means you are in the wrong gear.

It is because diesel engines don't have those pumping losses and resultant engine braking that exhaust brakes (and for large trucks, compression release brakes) were developed. Gasoline engines don't need them.
Down shifting a gas engine to slow it down will give you minimal braking while towing a trailer that is heavier than the truck. You either use the brakes or eventually the truck will increase in speed being pushed downhill and Will over rev the engine period. Gas engines do not heave the torque .
I towed with an F 150 Ecoboost and now I tow with an F 250 Diesel. There is no comparison. I can descend while towing our 30' classic from any of the passes out west with my cruise set at 45 mph and never have to touch the brakes. The engine rpm will hold steady.
If you believe there is no difference between diesel and gas you have never used a diesel period.
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Old 07-31-2018, 05:19 PM   #49
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Sky, then road, then sky... No, seriously it was intense. Not to mention the hair-pin curves!
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Old 07-31-2018, 06:32 PM   #50
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As a south Florida boy I’d say you’ll be fine. I returned from a trip recently though N Georgia, TN, and northern Alabama and was a little concerned about the “mountains”. I pull a 30’ bunk with my 1/2 ton 05 Sierra 6.0l gas. My family are truckers and they just said to use a lower gear going down hill. That’s what I did staying at the poste d truck speed and didn’t have to use the brakes much at all. Kept transmission in 2nd gear on some steeper ones and it held me around 50mph.
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Old 07-31-2018, 06:49 PM   #51
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Greenest truck is the one you have!
Yes!! So true!
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Old 07-31-2018, 06:51 PM   #52
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. I can descend while towing our 30' classic from any of the passes out west with my cruise set at 45 mph and never have to touch the brakes. The engine rpm will hold steady.
.
Frank, is that with or without an exhaust brake?
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Old 07-31-2018, 08:16 PM   #53
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Quote:
Originally Posted by ranchometal View Post
Check out: https://en.wikipedia.org/wiki/Sonora_Pass

We took our 1999 Chevy Silverado (gas) and 23D up and down that pass. up to 26% grades - yes - 26% grades. Felt a bit intense at times but both the TV and TT did fine. It was a cooler day, actually serious tiny hail at the pass, so that helped cool the brakes.

I always use the TT brakes to take me down to a speed in which I can then downshift the TV and let it handle the load.

You guys and your big diesels (read tongue-in-cheek joke here). Once day I'll get a diesel, but not until my truck gives up. Greenest truck is the one you have.

P.S. TV is 6-liter Vortec engine with 165K miles.

Thanks all for a fun thread!
I've ridden my road bike up and down that grade (Ebbetts pass). Yes, 26% is pretty insane. It about killed me going up. My bicycle had a hard time staying under 40 mph going down. They do warn that trailers are not advised. The hairpin curves are 5 mph at best. It's a popular road for superbikes. Not sure if I think you're brave or crazy for taking your trailer that way.
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Old 07-31-2018, 10:22 PM   #54
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Sky, then road, then sky... No, seriously it was intense. Not to mention the hair-pin curves!

Sounds like this:

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Old 08-01-2018, 08:25 AM   #55
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Frank, is that with or without an exhaust brake?
It's with the engine brake set on auto mode.
With that setting all I have to do is tap the brakes at the speed I want to set and the engine brake will hold that speed all the way down.
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Old 08-01-2018, 08:25 AM   #56
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Down shifting a gas engine to slow it down will give you minimal braking while towing a trailer that is heavier than the truck. You either use the brakes or eventually the truck will increase in speed being pushed downhill and Will over rev the engine period. Gas engines do not heave the torque .
I towed with an F 150 Ecoboost and now I tow with an F 250 Diesel. There is no comparison. I can descend while towing our 30' classic from any of the passes out west with my cruise set at 45 mph and never have to touch the brakes. The engine rpm will hold steady.
If you believe there is no difference between diesel and gas you have never used a diesel period.
Hi

Well, my trailer outweighs my truck by a wide margin. The F-250 does have a gas engine in it. No problem controlling speed going down a long 10% grade with the engine supplying the braking. Done it lots of times .... PA is full of grades ...

Bob
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Old 08-01-2018, 08:29 AM   #57
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Downshift my

My 06 f350 v10 has tow/haul setting that is perfect for towing up and down big Hills.
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Old 08-05-2018, 04:07 PM   #58
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I never had problems retarding speed going downhill when towing with gasoline tow vehicles. The gasoline engine's compression braking does quite well, and the braking effect increases as the RPMs rise. Since gasoline engines can sustain quite high RPMs without damage, they can develop a lot of compression braking which can be very effective. Some people just don't like hearing the engine turn over at 4000 RPM or whatever. It never bothered me, nor the engines.

Diesel is a different story. The design of the diesel engine allows no compression braking without some type of help. That's why the engine brake and exhaust brake were developed for diesels. These devices effectively close-off the exhaust side of the engine and thus inhibit downhill speeds. Before these were put on diesel engines, it took a bit more effort (and consternation) to get down a grade in a diesel when towing a load. But it could be done, and still is in many diesel vehicles. I found it no big deal to do.

My 1996 7.3L Ford diesel did not have an exhaust brake from the factory. No pickup trucks had them in those days. As a result, I towed without an exhaust brake in that diesel for 15 years or so. Then I read on some forums that I didn't have to go without an exhaust brake on that old Ford. I found that for about 20 bucks I was able to modify a warm-up valve control that allows that warm-up valve to act as an exhaust brake. It works good. Even though I didn't actually "need" an exhaust brake, it is nice to have one.
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Old 08-05-2018, 04:29 PM   #59
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I once took a performance driving course. One thing that the professional driver/instructor said really stuck with me. He said brake pads are cheap. Engines and transmissions are not. Not sure that this applies here but I still always think about that.
They may be cheap. But when you overheat them and ruin the rotors as well. Not only is it not cheap. It is not safe. The modern transmissions are designed to be shifted up and down. Use it.
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Old 08-06-2018, 07:27 AM   #60
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I totally agree with Twinkie. Just using your brakes to go over a mountain pass is begging for trouble. That's why diesel engines have engine brakes and all vehicles have multiple gears. I could not imagine going over Power River Pass in the Big Horn Mountains on Route 16 and not having my engine brake on my F250. The engine and engine brakes work in sync with one another. I rarely have to touch the brakes on the descent.
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