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Overdrive?

Discussion in 'The Garage' started by 84gmcjimmy, Mar 1, 2004.

  1. 84gmcjimmy

    84gmcjimmy 1 ton status

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    Hey, for you automatic guys, I was wondering what overdrive is? As you can tell with some of my Q's, im in the learning mode!! /forums/images/graemlins/thumb.gif
     
  2. Okiemuddog

    Okiemuddog 1/2 ton status

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    Overdrive is a an extra gear in an auto tranny, it has a higher ratio than a regular non-o/d tranny, enabling lower RPM on the highway, which means deeper gears can be run in your axles and o/d's usually have a lower first gear ratio than other autos /forums/images/graemlins/thumb.gif
     
  3. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    It's an extra gear made to save gas when you are cruising at higher speeds. Some guys choose to put lower gears in the axles than they would with a non OD auto tranny to gain more offroad power but defeats the OD purpose as far as saving gas. It just depends on what someone want's to do with the truck.
     
  4. heavy4x4

    heavy4x4 1/2 ton status

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    It's a gear that makes the output shaft turn more revolutions than what's coming in.
    How does this apply practically? Your engine will run lower RPM's at cruising/freeway speed, than an equally equipped truck with a TH350, TH400, or SM465 (all the top gears for those trannys is actually 3rd gear in a 700R4). Be careful though, if you run too low of RPM, your gas mileage may suffer because you're no longer in the engine's power-band (between 2200-2500rpm).
    With an overdrive tranny, you can run lower gears (higher numerically) in the axles to get better take-off/acceleration/crawl-ratio and not have your engine screaming while on the freeway. /forums/images/graemlins/waytogo.gif
     
  5. hi pinion

    hi pinion 3/4 ton status

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    most common auto trannys among k5s are 700 r4,if built right,ive been told they can be pretty tough.Isnt that right ,Bobby? /forums/images/graemlins/grin.gifJake
     
  6. u2slow

    u2slow 1/2 ton status

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    [ QUOTE ]
    It's a gear that makes the output shaft turn more revolutions than what's coming in.


    [/ QUOTE ]

    That's the definition I had in mind /forums/images/graemlins/thumb.gif
     
  7. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    [ QUOTE ]
    most common auto trannys among k5s are 700 r4,if built right,ive been told they can be pretty tough.Isnt that right ,Bobby? /forums/images/graemlins/grin.gifJake

    [/ QUOTE ]definantly! /forums/images/graemlins/waytogo.gif
    To a point though...and no Jake your not past that point. /forums/images/graemlins/smile.gif
     
  8. hi pinion

    hi pinion 3/4 ton status

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    I know a good cooling system is a must for those 700s....in on my 3rd /forums/images/graemlins/deal.gifoops 4rth 700.Got a "VOODOO" tranny lol /forums/images/graemlins/hack.gif /forums/images/graemlins/grin.gif
     
  9. 84gmcjimmy

    84gmcjimmy 1 ton status

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    Thanks for the replies guys! /forums/images/graemlins/bow.gif
     

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