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Old 08-02-2012, 10:45 AM   #11
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Thanks everyone. Seems to be unanimous. I guess I really showed my ignorance regarding RPMs and engines/trannies. On level surface, I was running between 1800 and 2000 RPMs and 58-62 MPH where I was most comfortable. Sounds like I just have to come to the realization that the engine isn't being "harmed"...it's just doing its job. All these new noises to get used to and trying to find a new "norm". Appreciate all your help!
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Old 08-02-2012, 11:43 AM   #12
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Eventually, when you get up to cruising speed the trans will hit it's final drive gear and stay there until the computer says so. LOL I use cruise control as much as possible when towing, it makes for the best fuel mileage. And since gas just hit $4.00 here overnight, we need all the help we can get.
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Old 08-02-2012, 06:13 PM   #13
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I put my truck in drive and hit t/h and exhaust brake buttons and go. The transmission is smart enough to pick a gear.
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Old 08-04-2012, 11:17 PM   #14
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I use a 1997 Suburban and the fellow at the transmission shop told me, "Do NOT pull a trailer in OD. Run it in 3rd." I'll put it in OD if going down a long hill, that's all.
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Old 08-05-2012, 10:15 AM   #15
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old Ford f150......o/d off
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Old 08-05-2012, 11:42 PM   #16
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One of the problems when towing in OD is that the rpm's are low which results in low line pressure in the transmission. Low line pressure will allow the transmission to slip and over heat the fluid. You may not notice the slipping and over heating but your transmission will let you know when it has had enough.
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Old 08-06-2012, 08:13 AM   #17
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Quote:
Originally Posted by dmax_83 View Post
I put my truck in drive and hit t/h and exhaust brake buttons and go. The transmission is smart enough to pick a gear.
I should clarify my response, my truck is equipped with an Allison trans and both 5th and 6th are O/D. I don't tow fast enough (68mph+) to drop into 6th so my truck stays in 5th, which is still O/D, by default.

When I owned a 1/2 ton, I never towed in O/D.
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Old 08-09-2012, 11:39 AM   #18
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I tow with a Buick Rainier and the manual says that it's OK to tow on OD under flat driving conditions, but the guy at the tranny place I use said that it should still be in 3rd. So that's what I do
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Old 08-09-2012, 12:48 PM   #19
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I have the Tow/Haul mode and OD Off. Transmissions are expensive and driving in OD will heat it up and kill it.

My truck performs much much better with OD Off. I'll cruise at about 58-60mph and 2400 rpm. My Hemi loves to run a 2400 rpm .... it's her sweet spot .....
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Old 08-11-2012, 09:16 AM   #20
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I do OD off on my F150 it revs way too low in OD at hwy speed.
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