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 3/8/2011 5:46 PM
 

Just started pulling a toad. Read on Mike Desch's site that I should shift out of overdrive to keep from overheating the tranny. I got the impression this was on hills. My question is how much hill justifies shifting out of overdrive. Most of my travel is from northern Florida across I-10 or I-20 to Texas, where the only inclines are overpasses. Am I OK to stay in overdrive on these routes, and perhaps shift out, say, going above Atlanta in Georgia, or do I just stay out of overdrive completely when towing?


Randy and Evelyn. 2002 Adventurer 35U,Triton V10. 2009 Saturn Vue. Plus Buddy the superdog.
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 3/8/2011 11:17 PM
 

Randy - Long ago I learned to drive my RV by the tachometer, not the speedometer. I have a V-8 in my MH and the max torque is generated at about 2650 RPM, which equates to about 65 MPH in overdrive. If conditions (hills, wind, etc.) cause the RPM to drop, then I get out of overdrive and attempt to maintain 2650. If that isn't possible, then we downshift until it is. The trick is learning to accept the speed your engine comfortably allows. Good luck. - Dave

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 3/9/2011 12:41 AM
 

Hi Randy:

Dave's advice is sound.

I found that I drove more "by ear" (the sound of the engine) rather than much else.

I only shifted out of overdrive when I was actually climbing some sort of grade. (The slight grades of overpasses don't count.)

I pull/pulled either a Dodge Dakota pickup or a Jeep Grand Cherokee, with the Dakota weighing at about 4500 lbs.

I had the very early Ford V-10 (with only 275 HP and the clunker Ford 4-speed tranny), and it pulled the toads with no problem. Now that I have the much newer V-10 (with 362 HP and the very smooth 5-speed Ford "Allison-work-alike" tranny), I have no problems at all.


Cheers and happy travels, Mike www.backroadtravelers.com
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