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muncie 4speed

Discussion in 'The Garage' started by chevyjunky77, Oct 6, 2003.

  1. chevyjunky77

    chevyjunky77 Registered Member

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    Hello to all my fellow 4X4 brothers.

    ?#1 Does anyone have info on modifying(or a business that can do it) a muncie 4speed w/granny gear to change the ratio from 1. to a .8 or so in fourth. I am looking for better highway gas mileage.

    ?#2 Is there a web site that can decipher option codes, engine/axle codes and so forth.


    thanx
    chevyjunky77
     
  2. kennyw

    kennyw N9PHW Premium Member

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    #1- look for a NV-4500 or add an aftermarket OD. There is no option for changing the gear ratio in your SM465. You can however regear both of your axles or go to taller tires for the overdrive effect...
     
  3. chevyjunky77

    chevyjunky77 Registered Member

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    what is a nv-4500
     
  4. kennyw

    kennyw N9PHW Premium Member

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    NV4500 is a 5 spd manual transmission that was used in 1994 and up GM 4x4's. It will bolt inplace of your SM465 but you need the kit Advance adapters sells to put a NP205 behind one.
     
  5. chevyjunky77

    chevyjunky77 Registered Member

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    do you happen to know the ratios
     
  6. kennyw

    kennyw N9PHW Premium Member

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    The earlier GM versions were a low gear of 6.3x:1 or something like that, 4th is 1:1 and 5th is about 0.73:1.
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    [ QUOTE ]
    do you happen to know the ratios

    [/ QUOTE ]
    Almost the exact same gear spacing as the 465, but with the added overdrive.

    Changing tire size or rear gears makes a big difference for a LOT less money than swapping in the NV4500. I'm assuming if you are worried about economy, you aren't too worried about wheeling? (no offense of course)
     
  8. chevyjunky77

    chevyjunky77 Registered Member

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    I dont need the high gears for that. It is that I drive I dont trailer.
     
  9. 75-K5

    75-K5 3/4 ton status

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    If you really wanted to spend money you could get a Ranger Overdrive, but I doubt you'd ever make up for what you pay for it in gas savings. Best bet is to get taller axle gears. With the sm465, you can afford to run lower axle ratios because of the granny gear and 3.58 2nd.
     
  10. chevyjunky77

    chevyjunky77 Registered Member

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    Im running 373. I guess Ill just live with it
     
  11. 87sm465np208

    87sm465np208 1/2 ton status

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    must be nice with 3.73's i have 3.08's with 33's and a 465 /forums/images/graemlins/ignore.gif.



    /forums/images/graemlins/usaflag.gif /forums/images/graemlins/truck.gif
     

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