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Old 05-31-2014, 07:43 AM   #11
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Use OD until your transmission starts to hunt for the right gear then manually downshift.

2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
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Old 05-31-2014, 08:30 AM   #12
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Thanks for the info,have been towing in 3rd.

2014 jayco 198rd 2005 Silverado 5.3 3:73 gear
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Old 06-01-2014, 10:48 PM   #13
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You will find that most people towing in OD have 3/4 and one ton trucks with heavier transmissions. Your transmission will last a lot longer towing in 3rd.
2011 Eagle 330RLTS with just about every option.
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Old 06-05-2014, 07:52 PM   #14
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My 2011 F250 has tow haul and I hate it. I just run it in D, if tranny starts shifting alot, I drop it in M 4 or 5 and run it flat out. If you have an OD option, I would not tow with it on. There ain't enough flow of oil going to the cooler, the OD clutch pack will fry even if you have an extra capacity cooler. I tried towing in OD once with one of my F150's, undercoating on the floor boards was sizzling around the tranny.
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Old 06-06-2014, 12:57 PM   #15
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In general, the TH button just change the transmission shift algorithim in the truck's computer allowing up-shifts and downshifts to occur at higher RPMs.

my '99 suburban K2500 didn't have a TH mode, but towed better and RAN COOLER when I used 3rd gear for everything but flat open interstate.

I now have a truck w/a TH mode. I still don't do a "set and forget" with it. If the transmission is hunting, I will manually downshift and keep the engine between 1500-1800 rpm.

Not true with my dad and his 2002 F150 and his 7000# 5er. He just uses D and lets the truck do all the work. 150K miles later and only normal maintenance.

Just keep your fluids fresh, watch the engine temp and don't drive too fast.

2010 Ram 2500 CCLB w/cummins and 6sp auto
2008 J-flt GII 26BHS (9300# gross)
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Old 06-08-2014, 10:56 PM   #16
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With both the previous truck (03 Silverado 4spd) and current (2012 Silverado 6 spd) I put in drive, hit tow/haul, turn on the headlights and proceed. The transmissions took care of when to shift with no problem.

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