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Thread: question

  1. #1
    Master Mechanic
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    Question question

    someone told me that you should not use the "OD" position for in town driving, that you should use the "D" position instead. is this correct, or is either one acceptable? I have been using the "OD" position for a long time without issue
    Jeff

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  2. #2
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    Default

    Well.....I have always driven in OD......no matter city or country. I do however never use OD when pulling the trailer.

    Overdrive will only shift at speed and Rpm's....I guess the reason is to limit the overdrive shift and lock-up position in city driving????

    Just a Thought!!!
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  3. #3

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    When I was driving my 89, I always drove it in D around town. It had 3.08 gears and just seemed to lug too much in OD around town.
    Gary

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  4. #4
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    Default

    my burb has factory 3.73 posi, so I figured using OD around town would help mileage
    I would never use it for towing

  5. #5

    Default

    Around town you may notice at times the trany shifting in and out of over drive quite a bit. That will kill your mileage, in town.

    It will also give the trany excessive work. In a town like Boston you would never go into OD even if it was engaged.

    Now a small town like mine it jumps back and forth a lot, little traffic except during tourist season.

    I have a question for ya.

    How come during deer season you can shoot the deer, but during tourist season you can’t shoot the tourists?

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  6. #6
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    Default

    good question

    so, I'll start using "D" instead
    Last edited by GM_Guy; 08-15-2007 at 10:14 PM.

  7. #7

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    Quote Originally Posted by 84fiero123 View Post
    I have a question for ya.

    How come during deer season you can shoot the deer, but during tourist season you canít shoot the tourists?
    Because Venison taste much better than tourists. The rotting tourist carcases just go to waste.

  8. #8
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    As long as the tranny isn't "hunting" for a gear leave it in OD.

    And for the record, I always tow in OD (28ft race trailer around 10K lbs). Again as long as it's not hunting for a gear, and the tranny is in good shape, you'll be fine.

    A friend has a 97 GMC 3500 Dually with a 7.4/4L80E and has towed in OD since new. He's got 140K miles on it now and pulls a 44ft 5th wheel race trailer.

    This is for 4L80's, the 4L60's could be too weak to tow with in OD.
    93 Suburban 2500, 454, 4x4 tow vehicle
    77 Trans Am, 9 sec pump gas street car, Pontiac Power

  9. #9

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    I've never had much experience with any OD tranny shifting or hunting for gears. The manual makes it pretty clear that you should never tow anything when in OD, and I take that a small step further, I turned off OD when hauling anything more than a couple of passangers.

    Steve
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  10. #10

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    I have yet to come on a time when I needed to pull it out of OD. I've never towed with the Burb yet, but if I did, I'd pull it into drive then, but around Slidell, I run in OD and it never seems to hunt for gears while in traffic.
    Christopher

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