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Old 11-13-2015, 05:24 PM   #113
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Or it may shift more...


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Old 11-13-2015, 07:33 PM   #114
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I find that the tow/haul mode on the newer transmission reduces "hunting" in slight to moderately hilly terrain.

On a related note, I recently let the tranny shift fairly often in more than moderately rolling hilly terrain, while monitering the temperature. It went no higher than 190 degrees. I'm wondering if the newer transmissions are more resistant to over heating during frequent shifting--- better cooling, new fluids, electronic shifting, etc? Any one know if this is true or what could explain it?
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Old 11-13-2015, 07:52 PM   #115
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A Duramax/Allison doesn't downshift when climbing a hill-


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Old 11-13-2015, 07:55 PM   #116
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The pickup gas V8's have plenty of torque, later models with five plus liters around 400 ft lbs, it's just reached at higher rpm's. The problem with constant shifting is easily cured by simply lowering the transmission into a lower gear and finding an engine speed generating enough torque. That will stop repeated shifting for hills and headwinds.

On our Ram 1500 5.7 Hemi towing our 25' FC, that gear is 4th or 5th of six gears depending on terrain, 1800 to 2100 rpm about 60 mph or so. The fuel economy is actually better when the engine is held at a constant speed, normally 10-12 mpg towing 60-65 mph, 20-21 mpg 65 mph not towing. We've seen better, but that's not the usual.
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Old 11-14-2015, 06:20 AM   #117
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Originally Posted by dkottum View Post
The pickup gas V8's have plenty of torque, later models with five plus liters around 400 ft lbs, it's just reached at higher rpm's. The problem with constant shifting is easily cured by simply lowering the transmission into a lower gear and finding an engine speed generating enough torque. That will stop repeated shifting for hills and headwinds.

On our Ram 1500 5.7 Hemi towing our 25' FC, that gear is 4th or 5th of six gears depending on terrain, 1800 to 2100 rpm about 60 mph or so. The fuel economy is actually better when the engine is held at a constant speed, normally 10-12 mpg towing 60-65 mph, 20-21 mpg 65 mph not towing. We've seen better, but that's not the usual.
Thanks for the input. The only trip I have taken is from New Mexico where I bought it to Minnesota. I have the 8 speed and did not feel that it shifted excessively.
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Old 11-14-2015, 07:25 AM   #118
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A Duramax/Allison doesn't downshift when climbing a hill-


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My dodge with 6.7 come along and 6 speed auto don't either, it is called horsepower and torque, it will keep pulling at 1000 rpm....
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Old 11-17-2015, 09:09 AM   #119
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My 2015 Ram CTD in tow haul will shift from 6 to 5 when it hits a hill to maintain 60 just towing over Ozark hills. It will stay in 5 after that. I've only got 1400 miles on mine.

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Old 11-17-2015, 10:24 AM   #120
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High loads plus low RPMs beats the crap out of your crankshaft bearings, both mains and rod journals. Downshifting is not evil.
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Old 11-18-2015, 11:22 AM   #121
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I keep the 6.7L Cummins between 1,450 and 1,650 rpm on the level and closer to 1,650 or higher on significant hills or mountains. The 1,650 rpm number is peak torque.
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