towing?? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 13 (permalink) Old 09-22-2007, 10:26 PM Thread Starter
 
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towing??

I just towed my fifthwheel home from the campground where we had it for the summer. trailer weighs about 9500-10000 lbs with our stuff in it. first time i towed it with my 02' duramax. truck is stock(for now). when i hit the highway i began cruising at about 65-70 mph. truck worked okay. rpm's at about 2000. when i hit any hills tranny downshifted and rpms went to close to 3000 and stayed there until we crested the hill. truck more or less maintained it's speed. i had tow mode engaged as well. for anyone out there who tows does this sound like normal operation? first diesel truck for me, so i'm just curious......... i was using the cruise control most of the time as well.
any comments would be greatly appreciated.:smoke
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post #2 of 13 (permalink) Old 09-23-2007, 01:57 AM
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its a v-8 diesel, torque curve is higher then inline 6. Put it in t/h and let it work. As long as the trans isnt getting too hot or constantly shifting back and forth dont worry abou ***.

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post #3 of 13 (permalink) Old 09-24-2007, 09:32 AM Thread Starter
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Quote:
Originally Posted by thejdman04
its a v-8 diesel, torque curve is higher then inline 6. Put it in t/h and let it work. As long as the trans isnt getting too hot or constantly shifting back and forth dont worry abou ***.
the only time the tranny downshifts is when going up a hill. once we crest the hill it upshifts back into high gear. tranny temp didn't get to 95 degrees.
just not used to a diesel.........different beast..........:thanks:
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post #4 of 13 (permalink) Old 09-24-2007, 11:55 AM
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That is normal operation but here is a hint ... The trans will not down shift if you stay above 70MPH.. Set the cruse at 71-72 and as long as you dont drop below 70 it will not down shift. if the Hill is large and it does drop below 70 yes this is normal for the trans to shift and rpm's jump way up .

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post #5 of 13 (permalink) Old 09-24-2007, 12:25 PM
 
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its normal for that truck its just the alliy doing what it does best
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post #6 of 13 (permalink) Old 09-24-2007, 02:04 PM
 
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Or you can buy a mild chip and that will go away.
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post #7 of 13 (permalink) Old 09-24-2007, 05:59 PM Thread Starter
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Quote:
Originally Posted by Stacked6600
That is normal operation but here is a hint ... The trans will not down shift if you stay above 70MPH.. Set the cruse at 71-72 and as long as you dont drop below 70 it will not down shift. if the Hill is large and it does drop below 70 yes this is normal for the trans to shift and rpm's jump way up .
thanks for the tip, Stacked6600. I'll try that next time I tow. As usual you guys are a wealth of knowledge.........cheers!:thanks:
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post #8 of 13 (permalink) Old 09-24-2007, 06:02 PM Thread Starter
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Quote:
Originally Posted by paul1987
Or you can buy a mild chip and that will go away.
i was thinking of buying a mild tuner but it kind of scares me. don't want to fry the ally........ a buddy of mine who is a mechanic says to keep it stock(boring...). that way you won't break things. i can see his point, but i wouldn't mind a little bit more towing power(especially when we go to new hampshire through the white mountains!!):smoke
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post #9 of 13 (permalink) Old 09-24-2007, 07:29 PM
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When i am towing anything close or over 10K i run a 40HP Tow tune. It does make a difference. And it is such a small tune that it will not effect the trans. :Thumbup:

1999.5 F250 4x4 super cab 7.3L With edge attituede.
Converter lockup mod and EBPV exaust brake mod.
Air Hog cold air intake. Muffler delete, 35s on centerlines.
New F650 dash upgrade..

1995 F250 Single cab long bed 2wd.


2001 LB7 2500HD SOLD
AEM Brute Force intake, 5 1/2 stack exaust, Diablo Sport Predator Programmer. PPE boost valve, Autolite gauges. Built Allison (Alto steels, Red eagle clutches, Transgo shift kit, transgo lockup valve, and Personal Mods : ) edelbrock 1792 lift pump.


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post #10 of 13 (permalink) Old 09-24-2007, 10:08 PM
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I would buy an exhaust an intake at first, and then a mild chip or tuner, like Diablosport Predator, or PPE Economy.

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