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Old 08-20-2015, 06:08 PM   #31
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Hey there Verretcat...I can offer only what I have experienced.

I have a 2012 Suburban w/ the 5.3 liter Vortec and the six speed transmission pulling my ROO 233S. LOTS of surface area on the front causes a good chunk of drag and for me to hit sixth gear even in Florida is rare.....I can do it with a tail wind on FLAT sections of interstate or slight downhill grades. I ALWAYS run in tow/haul mode even though my owners manual states it is really only needed for "heavier loads" but it doesn't state what that is. I have paid much attention to as many posts about towing as possible for fear I needed a diesel (many will jump that way immediately) but in my experience..... your stated RPM level and shift pattern on the hills is completely normal. I leave Florida about once a year for NC and the I-26 climb out of SC into NC has been the most stressful climb...I tend to run up to ~3000 rpm +/- and down into 3rd gear, sometimes even second before I top out that climb. Engine temps have jumped from the normal 210 to ~235 with tranny temps ~225 when it is full blown summer and 96 degrees with nasty humidity. All readings return to normal once climb subsides and my shift pattern and RMP goes back to normal as well. Hard to say what your noise is, my shifting occurs prettly cleanly and i DO hear LOTS of Fan noise as the loading increases on the drivetrain.

All my service checkups return no issues and I consider the truck to be a solid performer, in my experience and limited knowledge, the higher RPM's are a necessity in the gasoline engine and nothing at all to worry about. The longer period of time you run at the 3K range or higher the larger increase in noise and temperatures you will experience.

All over Florida and Georgia I run 2250-2800 rpm +/- depending on winds/grade/traffic and I have more than 10K miles of towing with this setup, truck still runs like a champ and never seems to mind hooking up the trailer and moving along. The SMARTEST and BEST thing you can do is relax and do not even attempt to maintain traffic speeds, ride you 60-64 mph range in the flats and watch the RPM's on climbs and IGNORE your speed...let the truck do its work without bustin' a nut and then once your setup at your favorite campsite, have an adult beverage and make mental notes about your drive so you know what to expect the next time.

I hope this helps!
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Old 08-20-2015, 06:13 PM   #32
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and PS..by your posted audio clip..all I hear is "normal" exhaust noise...have you noticed when not towing that if you "light it up" and try to get on it the exhaust noise increases rapidly until your speed and momentum begins to level out?
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Old 08-20-2015, 06:31 PM   #33
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Didn't think it would go in to 6th in T/H.
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Old 08-20-2015, 06:43 PM   #34
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My 1500 never would, and the 2500 Duramax does not. I thought it locked out the 6th speed.
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Old 08-20-2015, 06:45 PM   #35
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you are most likely correct Mike.t ..... I never shifted my trans to "M" to see if I was in sixth, just know that my RPM's came down low enough that I thought I must be in sixth gear. I truly have no knowledge of what Chevrolet designed the TH switch to accomplish, anytime I try to ask the dealer or any sort of "chevy person" for information nobody seems willing to share "technical data or reasoning" and as an Ex-Navy Nuclear Operator...I HUNGER for technical details of the "WHY and HOW" things happen!
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Old 08-20-2015, 06:49 PM   #36
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I do not know what it exactly does either... It is a TOW HAUL mode so when I TOW and Haul I turn it on... LOL

Whether I need it or not, i'll take the slight loss in MPG to not blow something up. But I do tow 9,000lbs.
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Old 08-20-2015, 06:49 PM   #37
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Seems a reasonable expectation....maybe my owners manual address this, but I can't recall if it did. And of course a google search returns MANY opinion's but I have yet to find a technical GM/Chevrolet document that definitively states "this is what the tow haul mode does..."

And I am RIGHT THERE with you doc73...my feelings are I am towing so it should be on! ;-)
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Old 08-20-2015, 06:52 PM   #38
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OH..and for the OP.....my little 5.3 liter chevy I consider doing well when I average 8 mpg over an entire tow trip...I really don't monitor or care where it goes real time, I know it sucks going into winds and up hill, but then again I resign myself to the knowledge that I am basically pulling a billboard behind my truck so what would I expect!
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Old 08-20-2015, 06:54 PM   #39
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Quote:
Originally Posted by ebemis View Post
Seems a reasonable expectation....maybe my owners manual address this, but I can't recall if it did. And of course a google search returns MANY opinion's but I have yet to find a technical GM/Chevrolet document that definitively states "this is what the tow haul mode does..."

And I am RIGHT THERE with you doc73...my feelings are I am towing so it should be on! ;-)

I know the manual does, but I cannot remember... EDIT: page 9-39 in the 2500 manual for a 2015..
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Old 08-20-2015, 07:12 PM   #40
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FOUND IT!
Tow/Haul is designed to be most effective when the vehicle and trailer combined weight is at least 75 percent of the vehicle's Gross Combined Weight Rating (GCWR). See “Weight of the Trailer” earlier in the section. Tow/Haul is most useful under the following driving conditions:
When pulling a heavy trailer or a large or heavy load through rolling terrain.
When pulling a heavy trailer or a large or heavy load in stop and go traffic.
When pulling a heavy trailer or a large or heavy load in busy parking lots where improved low speed control of the vehicle is desired.

Operating the vehicle in Tow/Haul when lightly loaded or with no trailer at all will not cause damage. However, there is no benefit to the selection of Tow/Haul when the vehicle is unloaded. Such a selection when unloaded may result in unpleasant engine and transmission driving characteristics and reduced fuel economy. Tow/Haul is recommended only when pulling a heavy trailer or a large or heavy load.

SO...it appears GM classifies a "large or heavy load" as one that is at 75% or greater GCWR.

However, I can't find any reference in the OM that claims what happens by engineering design in the transmission. I would LOVE to see a techincal document listing the "change in shift points" and any "gear lockout" or things of that nature...at least I would love to see one from GM that I know is right instead of reading french on the internet! ;-) ..what's the icon for tongue in cheek? ROFLMAO!
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