the_vfox
Minneapolis MN
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Joined: 01/15/2005
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When the trailer is hooked, the T/H is on.
Fox and Angel (Vinnie and Brenda) fuzz ball cats 
Don't call me on the weekend, Im out camping.
2004 Chevy Silverado LS 2500HD 4x4 DA 4dr 
2003 Jayco Eagle 263 29'Super Slide 
Dell Inspiron 1520/WIFI
Go Blue, US Air Force(retired)25 years
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old guy
Oregon (pronounced Or e gun)
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Joined: 03/15/2006
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It's judgement call, I use it when in hill country and turn it off on the flats, love to see the rpm's drop about 5 or 6 hundred Rpms. I just watch the truck for hunting gears. if it starts to hunt I turn it back on.
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H4Adventures
Minot, North Dakota
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Joined: 01/17/2008
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With the TT it's on all the time, with the boat it's off all the time for me.
2007 Zinger ZT30BH
2008 GMC Sierra 2500HD CC, 6.0/4.10
2004 Chevy Trailblazer
2003 Tracker Avalanche, 150EFI Merc.
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shaela21
Victoria, BC
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Joined: 08/12/2004
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When I am towing, I use the Tow/Haul mode. It is that simple.
Bob & Ang
Shaela & Duncan
2008 GMC Sierra 1500
2006 Outback 21RS
Victoria, BC
Canada "It's all good"
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bendjoseph
Broad Brook, CT, USA
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Joined: 07/06/2004
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Can you use cruise control when in tow/haul mode?
Ben & Sharon
2 Kids
1 Spoiled Golden
2004 Dodge Ram 2500 Heavy Duty, with the Hemi
33 Foot Prowler, 2004
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coolbreeze01
Redding, Ca
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Joined: 08/24/2006
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bendjoseph wrote:Can you use cruise control when in tow/haul mode?
Yes, with my truck.
2008 Dodge 3500 CTD LB SRW 4X4 6-Speed Auto
P3 Blue Ox Sway Pro
2007 Komfort 212
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Hamops
Oshawa, ON, CA
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Joined: 01/26/2003
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bendjoseph wrote:Can you use cruise control when in tow/haul mode?
Absolutely!! Here's a trick when using T/H. If the tranny won't upshift after it had to downshift, and everything is back to the set speed and the extra power of the downshift is not required, momentarily turn off T/H until the tranny upshifts, then turn T/H back on. Always use T/H when towing.
Helen & George VE3INB and Max (Bichon Frise)
06 Silverado LT 2500HD D/A
2006 Crossroads Cruiser CF30SK
Prodigy Brake Controller
16K Reese Slider with a Bedsaver
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BenK
SF BayArea
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Joined: 04/18/2002
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Use the 'tow/haul' function whenever 'towing' or 'hauling' anything.
It's for folks who don't want to or know how to manage their automatic
transmissions themselves. Plus there are additional attributes that
only the computer can manage without undue complexity to the various
buttons/switches/etc that 'could' be there to get at these other functions.
Like locking up the TC, changing the ATF pressure, timing of the
various valves opening/closing, etc, etc.
Another area that the change in software algorithms is with the various
safeties. On that, mainly tempurature and in reference to the various
power modes allowed or not allowed for both the tranny and engine.
-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...
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jvann1
Whidbey Island, Wa.
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Joined: 09/08/2004
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Even in the "flat lands" you have the wind resistance factor! I believe that still puts the same load as a carry weight or such in hills and tow haul should be on. Sort of like putting multiple sheets of flat plywood up and its not going to cause any load on the truck because its flat land! If you tow or haul, that is what it is there for.
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SmokinDiesel05
NJ
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Joined: 07/15/2008
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My CUMMINS ( No G ) has been in T/H mode since day 1 . I feel the tranny gets less of a workout since it doesn't hunt between gears all the time . The TC stays locked a lot more which in turn produces less heat . JMHO
As a side note , Since you have an 08' , your T/H button may have the added feature of locking out overdrive  I know they added the option after 05 ( 06' ? ) but not sure if they did away with it . Go to www.dieseltruckresource.com and all your Cummins related questions can be answered there !
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