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The truth about overdrive

Discussion in 'Trucks and Trailers' started by rookiemower, Mar 3, 2004.

  1. rookiemower

    rookiemower LawnSite Senior Member
    Messages: 766

    All right everyone i'm confused. one time i here it's better to haul a trailor with overdrive on like normal driving. The next time i here its better with it off while hauling, what is it? I'm worried about my trans (2000 Explorer) it seems like it started to slip maybe. What is the correct way:( ;)
  2. sodzilla

    sodzilla LawnSite Member
    Messages: 219

    I used to haul cattle. 120,000 miles a year. Ford PS with auto. Never took it out of overdive. Never had a problem. Pulled a 24' gooseneck with average of 9,600 -10,000 pounds of cattle.
  3. qualitylandscaping

    qualitylandscaping LawnSite Bronze Member
    Messages: 1,581

    Overdrive on... It only kicks in when it needs to, so if it goes on you need to stop, lol:cool:
  4. Dragonscapes

    Dragonscapes LawnSite Member
    from Ontario
    Messages: 31

    From what several licensed mechanics have told me. When hauling a load like a trailer what usually happens is that on an automatic almost all vehicles shift to early and cause the engine to work extra hard on the tranny to get it's self up to the right speed. I've always driven in drive until it's near usually 90-100 KM/h about where the vehicle is set to shift to OD. Then shift to OD never a problem haven't had any problems with tranny's slipping yet I do the same in winter when I plow
  5. MudslinginFX4

    MudslinginFX4 LawnSite Bronze Member
    Messages: 1,170

    I usually turn my overdrive off when pulling trailers. Thats what I have always been told.
  6. Metro Lawn

    Metro Lawn LawnSite Silver Member
    Messages: 2,116

    Owners manuals for Ford, GM, and Dodge all recommend turning the overdrive off when towing or severe transmission damage may occur.
  7. Blk94fiveOh

    Blk94fiveOh LawnSite Member
    from MN
    Messages: 112

    190K on my 95 f-150. I towed with the O/D OFF with it every day during the lawn season for 4 years, and Its still running great today. Make sure you have a large "plate" style tranny cooler. You should also change the fluid anually.
  8. GarPA

    GarPA LawnSite Silver Member
    from PA
    Messages: 2,585

    I turn it off unless I;m on a flat, higher speed highway
  9. 65hoss

    65hoss LawnSite Fanatic
    Messages: 6,360

    The trans in SD and HD trucks are different. Much stronger.

    In 1/2 ton trucks the OD should be turned off when pulling unless your at highway speeds. In town driving should have the OD off. The OD has less clutches in it. The going in and out under heavy load will kill them.
  10. GreenMonster

    GreenMonster LawnSite Silver Member
    from NH
    Messages: 2,702

    As several have already said:

    OD is ok for flat, highway speeds.

    Pulling hills and in town should be out of od. Multiple auto shifting not good.

    I think you should have a transmission cooler on anything, especially a 1/2 ton. Many of the 3/4 and 1 tons come with this from the factory.

    Owner manuals say to change fluid every 35k. If you're towing a lot, more frequent changes is cheap insurance.

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