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What gears would i need

Discussion in '1982-Present GM Diesel' started by 84CUCV, Feb 3, 2006.

  1. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    My father said i can have the rears out of his M1008. He wants rears that could do 70mph with stock tiers that would be great he said. So what gears do i need? as always thanks for the help guys
     
  2. colbystephens

    colbystephens 1 ton status GMOTM Winner

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    depends on your truck, your purpose, your tire sizes, etc.
     
  3. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    The rears would be going into a stock M1008. My dad wants stock tiers. He just wants to be able to do 70 down the parkway.
     
  4. imiceman44

    imiceman44 1 ton status

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    I think you want the tallest gears available for that axle.
    You are talking M1008 so that would be the 5/4 ton with a 14bff rear so 3.42 is the tallest you will find and will easily do 70MPH on stock tires.
    You could try and find the rare 3.30 gears but it's not worth it.
    You can even get the 3.73 gears and get 70MPH and might get better driveability as in power.
    With the 3.42 gears you can drive the truck empty but hauling with it will be sluggish.
    IceMan
     
  5. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Ok i will look for 3.73s thx
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    3.73's with 31's it would still be spinning at 2900 rpm at 70 mph. I doubt your dad would be too happy with that. I'd get some 3.21's, that would get the R's down to about 2500 at 70.

    Rene
     
  7. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    3.21s i never even heard of. Are they common? thx Rene
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I know u2slow found some 3.21's for his 14 bolt, they are pretty uncommon though. Might need to order some gears instead of hoping for some readily available factory offerings...

    Rene
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Just re-read the orginal post...why not chuck some 3.08 geared 10 bolts under it? Great for freeway and should live just fine on the street with stock tires.

    Rene
     
  10. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Rene, you just said it. that should be fine. thx
     
  11. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Yeah, with 31's it'll be turning about 2350 rpm at 70 mph...as perfect as it gets without an overdrive tranny.

    Rene
     
  12. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    OK my father would like to keep it 8 lug. So i could use my tiers to help with the gears to. I have 33s 35s and 36s. thx
     
  13. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    3.73's and 36's then...~2450 rpm at 70 mph.

    Rene
     
  14. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    sweet thanks rene
     
  15. kennyw

    kennyw N9PHW Premium Member

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    3.42 gears are very common in 10 bolt front/14SF 8 lug rear axles too...
     
  16. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    Really, ok thx
     
  17. darkshadow

    darkshadow 1 ton status

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    i will trade you axels.


    I have a 10/14sf with 3.73s, 8 Lug, grate shape, let me know :D
     
  18. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    trade for what??
     
  19. darkshadow

    darkshadow 1 ton status

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    the m1008 axles :D
     
  20. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    OK that would be your rears and some cash.....:wink1: :wink1:
     

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