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Good gear ratio for 38's?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BLzr4x4ngkid, Mar 13, 2001.

  1. BLzr4x4ngkid

    BLzr4x4ngkid 1/2 ton status

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    Good gear ratio for 38\'s?

    I plan on buying this 14FF from Wes here pretty quick and it has 4.11's in it already. I was just wondering what a good ratio would be to turn 38's. I stole a BIG parts catalog with lifts, shocks, t-cases, etc. from 4WPW and there is a gearing chart. With 4.11's, I'd be fine, but just curious what everyone else thinks.

    "Don't hit me with them negative waves so early in the morning." Odd Ball--Kelly's Hereos
     
  2. DBLAZER

    DBLAZER 1/2 ton status

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    Re: Good gear ratio for 38\'s?

    What transmission do you have???

    [​IMG]
    <A target="_blank" HREF=http://dblazer.coloradok5.com>http://dblazer.coloradok5.com</A>
     
  3. flcpl4fn

    flcpl4fn 1/2 ton status

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    Re: Good gear ratio for 38\'s?

    i have 4:88's in mine with 38's and it works real good on and off road. i have a 700r4 and 208 t-case.

    '85 Jimmy in Jax, Fl
     
  4. muddin4fun

    muddin4fun 3/4 ton status

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  5. '73 K5

    '73 K5 1/2 ton status

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    Re: Good gear ratio for 38\'s?

    I had 4.56's on my old Jeep with 36's, and it was great. Even without an overdrive. I'd go with either 4.88's or 5.13's since you do have the overdrive. Later

    '73 K5
    Chevy good...Ford bad
     
  6. bigerik

    bigerik 1/2 ton status

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    Re: Good gear ratio for 38\'s?

    I have 5.13s for my 38" tires, and I would get lower gears if they made them for the 14FF. I would actually like 5.38s or 5.84s but couldn't find any when I bought gears. I have a Turbo 350, and the high rev on the highway doesn't bother me. I rev 3000 rpm at 60 mph and 3500 rpm at 70 mph (I think). Go as low as the pumpkin accomodates: 5.13. You'll be glad you did when you are trying to go down a dirt hill slowly or accelerate quickly. See my beasts at http://www.bigerik.coloradoK5.com . Good luck!
     
  7. 90K5

    90K5 1/2 ton status

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    Re: Good gear ratio for 38\'s?

    Good job on the steal...that place deserves it.[​IMG]

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  8. white_knight

    white_knight 1/2 ton status

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    Re: Good gear ratio for 38\'s?

    Like DBlazer said, what tranny do you have?
    If you're running an M465 you can get away with higher gears (what you have now).
    But you know how it goes the lower the better

    <A target="_blank" HREF=http://www.whiteknight.scriptmania.com/>http://www.whiteknight.scriptma
    nia.com
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  9. 4GUNZ4X4Z

    4GUNZ4X4Z 1/2 ton status

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    Re: Good gear ratio for 38\'s?

    5.13's. When I get a 14ff I'm going 5.13's. If I can find a rear d60 then I'm going lower.

    <font color=blue>Professional <font color=red>JEEP EATER</font color=red> it's a population control thing.</font color=blue>[​IMG]
     
  10. Cliffy

    Cliffy Registered Member

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    Re: Good gear ratio for 38\'s?

    I have 4.11's as well and plan on running the new 37x12.5x16 SSR's. I"m concerned my gearing will be too high for my 350/350/205 set-up, so I'm builing a big block. I'm hoping the tourqe will make up for the gearing.

    Coil sprung 71 blazer.
     
  11. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Re: Good gear ratio for 38\'s?

    My project C14/D60 combo came with 4.56 so that is what I plan on running with the 39+ tires I will be installing as soon as I finish the mechanicals. If it were any lower, I would go with 5.13s but there is not enough difference (IMHO) to pay for the change from 4.56...

    Bad Dog

    85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56
    Coming soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
     
  12. BLzr4x4ngkid

    BLzr4x4ngkid 1/2 ton status

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    Re: Good gear ratio for 38\'s?

    I have a 700R4 tranny. I have heard the same thing about 4.56 and 5.13's..........there's not much difference. I'll have some time to think about the gears.

    "Don't hit me with them negative waves so early in the morning." Odd Ball--Kelly's Hereos
     

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