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Old 09-17-2015, 03:29 PM   #1
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Towing Question

Hello to all you nice RVers and just wanted to get some input on what gear I should use while towing my Travel trailer I have been getting answers all over the place . The place I bought my 30ft RV told me to use Over Drive and that just don't sound right to me I am pulling a 30ft. Bumper pull trailer approx 8,000 Lbs loaded with my 2004 GMC 2500 Hd Duramax LB7. The only place I go is from Chattanooga tn to Ocala Fl once a year and maybe around here to a get the trailer worked on. I feel I should use the Tow Haul mode and maybe not even that unless it downshifts a lot on some grades . Thanks for any input on this matter .
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Old 09-17-2015, 04:00 PM   #2
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Originally Posted by gibby72 View Post
Hello to all you nice RVers and just wanted to get some input on what gear I should use while towing my Travel trailer I have been getting answers all over the place . The place I bought my 30ft RV told me to use Over Drive and that just don't sound right to me I am pulling a 30ft. Bumper pull trailer approx 8,000 Lbs loaded with my 2004 GMC 2500 Hd Duramax LB7. The only place I go is from Chattanooga tn to Ocala Fl once a year and maybe around here to a get the trailer worked on. I feel I should use the Tow Haul mode and maybe not even that unless it downshifts a lot on some grades . Thanks for any input on this matter .
I use tow/haul mode 100% of the time when towing.
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Old 09-17-2015, 05:41 PM   #3
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You list a 2004 RV. Is it "OD Off/ On" or "Tow/ Haul".

They are different and do different things.

In either case, towing that much weight, turn on "O/D Off" making it a 3 speed transmission or put it in "Tow/Haul" for the many benefits of that mode, including delayed upshifting to help in acceleration and automatic downshifting to help in braking.
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Old 09-17-2015, 06:37 PM   #4
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Using 3 only keeps the gear your in at a higher Rpm tow/haul makes the truck shift at a higher rpm though all the gears I use tow/haul on my truck only taking off from a stop and large hills


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Old 09-17-2015, 07:21 PM   #5
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Just to be clear, owners need to understand that there is NO Tow/Haul mode in 1999 to around 2004 transmissions.

The 4 speed 4r100 have Overdrive Off/ On. The shift indicator is P,R,N,D,2,1

The 5 speed 5r100 have Tow/Haul. The shift indicator is P,R,N,3,2,1.
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Old 09-17-2015, 08:27 PM   #6
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My 99 sierra had tow/ haul with a 4l80 trans. My 2001 silverado had tow/haul with a 4l60 trans. I used it on both whenever towing. It makes things last longer. long story short.
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Old 09-17-2015, 08:39 PM   #7
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Originally Posted by gibby72 View Post
Hello to all you nice RVers and just wanted to get some input on what gear I should use while towing my Travel trailer I have been getting answers all over the place . The place I bought my 30ft RV told me to use Over Drive and that just don't sound right to me I am pulling a 30ft. Bumper pull trailer approx 8,000 Lbs loaded with my 2004 GMC 2500 Hd Duramax LB7. The only place I go is from Chattanooga tn to Ocala Fl once a year and maybe around here to a get the trailer worked on. I feel I should use the Tow Haul mode and maybe not even that unless it downshifts a lot on some grades . Thanks for any input on this matter .
I think you are on the right track, if your rig is going smoothly without excessive downshift, why would you keep the OD off
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Old 09-17-2015, 09:04 PM   #8
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I miss read the post, thinking Ford transmission. Disregard anything I said, sorry.
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Old 09-18-2015, 06:01 AM   #9
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I pull a 16,000#+ 5er with an 03 duramax, you put it in T/H and let the Allison do its thing, the only time that I have had to lock out the OD is when pulling a long grade that causes the trans to shift up and down more than a couple times. With your 8000#, you probably won't have worry about it.
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Old 09-18-2015, 07:27 AM   #10
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I pull a 16,000#+ 5er with an 03 duramax, you put it in T/H and let the Allison do its thing, the only time that I have had to lock out the OD is when pulling a long grade
That's pretty much how it works with the D/A combo. On long steeper grades, such as Monteagle pass on I24 I manually shift to a gear that keeps the RPM at 2200-2400. Other than that the T/H button means what it sez.
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Old 09-18-2015, 08:24 PM   #11
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Basic RPM for Diesels is 1800 to 2000 for Max torque. RPM for gas is 3000 for Max torque.
I always advise that Max performance is at top torque.
So towing is best at max torque. If the tranny shifts often out of O/D for Diesel which is rare it's best to stay off. Gas trucks will always give best performance with any load off O/D.
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Old 09-19-2015, 05:07 AM   #12
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When hooked up I always use T/H and let the Allison do it's thing. I don't lock out the OD cause the truck is smarter than I. We have towed our 5er up and the Rockies and through Glacier many times. Still runs like a champ, 2004 Chevy D/A LLY.
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