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Old 04-17-2014, 06:12 PM   #21
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Caught my brain fart, I was confusing GVWR and curb weight, silly me.
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Old 04-18-2014, 09:13 PM   #22
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I Use tow haul every time. Allows transmission to downshift and use engine for compression braking. saving your brakes. A big plus on hills. Try it with and without you can tell.

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Old 04-18-2014, 09:27 PM   #23
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ABSOLUTELY! With our duramax these things will pull just about anything, but with it in T/H mode the transmission shift points change, up shift takes longer and down shift comes quicker, huge benefits and we only tow 10k, I was also able to hook up the factory exhaust brake and that will stay engaged down to 20 MPH, so we feel very comfortable with our set up. Hardly ever use the brakes!
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Old 04-22-2014, 10:16 AM   #24
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I have a 2012 F150 with the EcoBoost and if any trailer is hooked up I have tow/haul engaged. With the 3.7 I strongly suggest you have it on when towing your TT
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Old 04-22-2014, 10:43 AM   #25
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I leave it on when towing unless I hit a long flat stretch. Especially helpful when going down hills as it will automatically downshift for you.
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Old 04-22-2014, 10:54 AM   #26
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Had tow/haul mode on my 2010 F150.5.4...and..have it on My 2012 F250 6.7... I ALWAYS use it when towing
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Old 04-22-2014, 10:57 AM   #27
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Even towing on a long, flat stretch, I leave my tow-haul on. And mine DOES allow it to go into overdrive under those conditions, judging by the RPM's I'm seeing. Could be due to the weight on my trailer, which I tow at about 5,300 pounds.
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Old 04-22-2014, 11:04 AM   #28
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Leave it on when towing. Saves the brakes and helps cool the transmission
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Old 04-22-2014, 11:43 AM   #29
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ON/OFF ?

Our tow vehicle is a 2001 Silverado 2500HD, Gas, Ext. Cab. The owners manuals tells us that, towing in tow/haul should be used in hilly or rolling Taren as it cuts down on the downshift occurrences, on flat level ground, tow/haul is not necessary as downshifts are rare. Gas mileage is better when operating under the latter conditions. We have also discovered that when in cruise control and tow/haul engaged, the transmission on flat and level ground is much more sensitive and annoying.
Our coach is a Crusader 270RET Fifth Wheel, dry weight 7740, with 2740 additional gross weight allowed. The tow vehicle is rated at 12,500 GW.
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Old 04-22-2014, 11:43 AM   #30
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In the majority of cases it's a good feature to use.

However - as long as the highway grade is minimal or flat, I'm in O/D. My 6L gasser pulls the 5er great in overdrive at 2,000rpm at 65 mph, and my trans temp never gets above 175F.
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