Is it O.K. to drive with OD off for long periods?

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Thread: Is it O.K. to drive with OD off for long periods?

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    Junior Member molex's Avatar
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    Question Is it O.K. to drive with OD off for long periods?

    Yup, this is a TOTAL novice question, but then, I am a TOTAL novice!

    I drive with my OD on 99.99% of the time. The truck came off the lot with the OD on, and when I turn the OD off an annoying idiot light (appropriate term) comes on. Well, a light is on, so doesn't that mean I shouldn't do this for too long?

    When in town and doing any kind of up-hill driving (about 90% of my driving is one of these), having the OD off really is nice. So am I doing any harm by leaving it off most of the time? I like having that low-end punch, I rarely need the luxury of a smooth ride at 70 mph.... Basically, I'm asking if I can trade my ratios from OD on 99% of the time to OD off 99% of the time without hurting my baby.

    thanks for helping this youngster, I appreciate it!

    P.S. If driving with the OD off all the time is O.K., is there an easy way to make that stupid O/D OFF dash light go away?

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    Junior Member ripshion's Avatar
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    Quote Originally Posted by molex
    Yup, this is a TOTAL novice question, but then, I am a TOTAL novice!

    I drive with my OD on 99.99% of the time. The truck came off the lot with the OD on, and when I turn the OD off an annoying idiot light (appropriate term) comes on. Well, a light is on, so doesn't that mean I shouldn't do this for too long?

    When in town and doing any kind of up-hill driving (about 90% of my driving is one of these), having the OD off really is nice. So am I doing any harm by leaving it off most of the time? I like having that low-end punch, I rarely need the luxury of a smooth ride at 70 mph.... Basically, I'm asking if I can trade my ratios from OD on 99% of the time to OD off 99% of the time without hurting my baby.

    thanks for helping this youngster, I appreciate it!

    P.S. If driving with the OD off all the time is O.K., is there an easy way to make that stupid O/D OFF dash light go away?
    If you read your owners manual it says to leave it on full-time, you'll get better gas mileage. Once in a while I will turn it off if I'm pulling my boat up a hill etc. otherwise it stays in OD all the time.

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    Quote Originally Posted by molex
    Yup, this is a TOTAL novice question, but then, I am a TOTAL novice!

    I drive with my OD on 99.99% of the time. The truck came off the lot with the OD on, and when I turn the OD off an annoying idiot light (appropriate term) comes on. Well, a light is on, so doesn't that mean I shouldn't do this for too long?

    When in town and doing any kind of up-hill driving (about 90% of my driving is one of these), having the OD off really is nice. So am I doing any harm by leaving it off most of the time? I like having that low-end punch, I rarely need the luxury of a smooth ride at 70 mph.... Basically, I'm asking if I can trade my ratios from OD on 99% of the time to OD off 99% of the time without hurting my baby.

    thanks for helping this youngster, I appreciate it!

    P.S. If driving with the OD off all the time is O.K., is there an easy way to make that stupid O/D OFF dash light go away?

    It's an overdrive gear, like for highway driving. if you are driving around town on surface streets or if you wheel it is a good idea to turn it off. If you start to get over 50mph you will increase gas mileage if you turn it on, however if you are doing a lot of shifting ie: stop and go traffic, you may want to leave it off.

    Play with it. It is common for towing at 50 - 60mph without the overdrive on especially on grade.

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    Junior Member molex's Avatar
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    Quote Originally Posted by ripshion
    If you read your owners manual it says to leave it on full-time, you'll get better gas mileage. Once in a while I will turn it off if I'm pulling my boat up a hill etc. otherwise it stays in OD all the time.
    Right, but I don't care about gas mileage, I bought a 4.7L V8 afterall. All I care about is any potential damage to the engine or drive train.

    So, since gas mileage means nothing to me (oops, I think the ozone hole just got an inch bigger..... what's an ozone hole?), are there any other issues with driving OD off all the time?

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    KLS
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    Nope. It's actually easier on the engine and the input end of the transmission to drive with O/D Off until you get to sustained really high rpms.


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    You'll wear the engine out marginally quicker. Basically you want to override the CPU's decision about overdrive when the truck is lugging or shifting with frequency.

    CJ

    Quote Originally Posted by molex
    Right, but I don't care about gas mileage, I bought a 4.7L V8 afterall. All I care about is any potential damage to the engine or drive train.

    So, since gas mileage means nothing to me (oops, I think the ozone hole just got an inch bigger..... what's an ozone hole?), are there any other issues with driving OD off all the time?

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    According to what the owners manual says, if I remember correctly -- it says to turn O/D off if you find it is hunting gears excessively and to turn it back on after the portion where it was hunting gears as long as the RPMS do not stay very high for too long, for improved gas mileage.

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    you can shut it off and it will be fine- just watch your tech - if your spinnin alot above 3000 rpm then start to turn it on- otherwise it can not hurt your truck -just remember this aod tranny is a new thing- in the 60's and 70's there was no overdrive and the cars and trucks had the close to the approx. rear end gearing as tundra - so remember to keep an eye on the tech -
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    The rules for me are:

    1) OD off if the engine can't make up its mind about whether to use it or not.

    2) OD off if I'm climbing a grade and the torque convertor won't stay locked with OD on.

    3) OD off if I'm descending a grade and use engine braking.

    Otherwise, OD is there to be used and I use it.

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    Quote Originally Posted by KLS
    Nope. It's actually easier on the engine and the input end of the transmission to drive with O/D Off until you get to sustained really high rpms.

    Ken
    Ballpark, what kinda RPM's are we talking about. I ran my truck at 3,400 with the O/D off for 150 miles this past weekend, pulling a lightly loaded single axle trailer. The motor sounded a little high, but not to bad.
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    I have done lots of miles on my truck at 3,500 - 3,800 rpm. I usually don't hold it over 4,000 for very long unless I am playing or towing a heavy trailer uphill. I have noticed that my oil pressure drops if I stay over 4,800rpm. This was with the old dipstick - I have never checked with the new oil level - probably no difference. So far the only rotating piece that has failed in 160k was the fan clutch. I leave O/D on most of the time when I am cruising on the highway over 70, off in the mountains, or when I am in traffic. I also sometimes downshift to 2 or L depending on how fast traffic is going. I like to be around 2,500 - 2,800 so I can step on it and pretty quickly get to the 3,400 rpm power band w/o downshifting, and also not have it do that stupid 1st-slip-2nd shift when I am in slow moving traffic (every single morning).
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    Joe
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    Speaking strictly for myself, I don't worry about the engine speed until the needle gets close to the RED line. Running synthetic motor and transmission oil also helps for "peace of mind" while running at sustained high RPMs. Another way an individual can look at running with O/D on or O/D off is, when running with O/D on your engine is "working" harder to give you slightly better gas mileage and when you turn the O/D off your engine helps you "play" at lot easier. If your engine could talk it would thank you for selecting O/D off and as long as gas mileage and top-end speed aren't a factor, there is no downside to running your Tonka Toy in O/D off mode.

    Here's your gear ratio's:
    1st - 2.80
    2nd - 1.53
    3rd - 1.00
    O/D - 0.705
    Reverse - 2.393

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    CJ
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    Cool Not exactly true

    Your engine is designed to run optimally at a particular RPM range. I don't know what it is, but the engineers designing it took that into account when matching it up with the tranny specs. Yes, engines under strain will add to the wear and tear of pieces and parts and fluids, but it's a fact that revolutions cause wear at a higher rate, as I pointed out before.

    Generally, the more efficient the engine runs, the less fuel it will consume.

    If all you want is responsiveness, then yes, shift it yourself and keep it out of OD, but to address the original question, harm CAN come from not using the OD. Of course those of you who plan to get rid of the truck before you wear it out wouldn't care a whole deal, but those of use who do, well, we do/should.

    Most of the advice, particularly those in line with what DJ said, is valid.

    CJ


    Quote Originally Posted by Joe
    Speaking strictly for myself, I don't worry about the engine speed until the needle gets close to the RED line. Running synthetic motor and transmission oil also helps for "peace of mind" while running at sustained high RPMs. Another way an individual can look at running with O/D on or O/D off is, when running with O/D on your engine is "working" harder to give you slightly better gas mileage and when you turn the O/D off your engine helps you "play" at lot easier. If your engine could talk it would thank you for selecting O/D off and as long as gas mileage and top-end speed aren't a factor, there is no downside to running your Tonka Toy in O/D off mode.

    Here's your gear ratio's:
    1st - 2.80
    2nd - 1.53
    3rd - 1.00
    O/D - 0.705
    Reverse - 2.393

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    Joe
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    Default opinions are like a.o., everyone has one

    Quote Originally Posted by CJ
    Your engine is designed to run optimally at a particular RPM range. I don't know what it is, but the engineers designing it took that into account when matching it up with the tranny specs. Yes, engines under strain will add to the wear and tear of pieces and parts and fluids, but it's a fact that revolutions cause wear at a higher rate, as I pointed out before.

    Generally, the more efficient the engine runs, the less fuel it will consume.

    If all you want is responsiveness, then yes, shift it yourself and keep it out of OD, but to address the original question, harm CAN come from not using the OD. Of course those of you who plan to get rid of the truck before you wear it out wouldn't care a whole deal, but those of use who do, well, we do/should.

    Most of the advice, particularly those in line with what DJ said, is valid.

    CJ
    I wish now I would have kept quiet on this topic or worded my reply differently but since my post was replied to I “feel the need” to respond; so one doesn't think I abuse the hell out of my Toy. I very seldom go over 4K rpms and almost every time I have is when I'm sleeping at the wheel in cruise control and suddenly wake up when the O/D downshifts into second on a steep climb and the needle goes into the red line while maintaining 75 mph. This is a rare occurrence as I normally run with O/D off in hills and mountains, but it will get your attention in a hurry. The point I was trying to make and I didn’t do a very good job in wording it was O/D on can lug the engine in several driving instances while O/D off will prevent "lugging" in those same circumstances. I still maintain O/D off has absolutely no downside to it unless of course, one uses no common sense in their driving habits. I disagree with the statement "harm CAN come from not using the O/D." If that statement was inferring that harm can come, if one is always pushing the red line in O/D off as opposed to driving with O/D, hence, running at a lower rpm level. I totally agree. However, towing a trailer at 3200/3500 rpms, keeping your O/D off for 12 hours in the mountains at 3500 rpms a couple times a month or constantly keeping your O/D off in city driving is not harming your engine or drive train. The additional wear factor IMO is miniscule under these conditions when compared to driving with the O/D on at 2200 rpms across the prairies. I say this as I put several hundred thousand miles on my engines and I only ran into serious problems with one engine – a Ford – 360 c.i. – took two short blocks to find a winner.

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    My rule for the O/D are

    OFF around town, help control speed more than save wear and tear on the engine. I come from world of manual trans, so I hate having to drag the brakes to adjust my speed.

    ON for highway or anything above 45 MPH


    I believe the trans can electronically lock and unlock the torque converter in both 3rd and 4th gears. So on grades the trans might unlock, but not down shift too.

    T-G

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