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Gear swap....4.56 or 4.88?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BLzr4x4ngkid, May 11, 2003.

  1. BLzr4x4ngkid

    BLzr4x4ngkid 1/2 ton status

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    I'm thinking about lower gears in my truck. I have a TH350 NP208 14FF D44. I'm running 39.5/18-15 Boggers on 15x14 wheels. I'm getting ready to drop the wheels down to either 15x10 or 15x12. That hasn't really been figured out yet. I was just wondering if 4.88 would be too much? I have 4.10 now and a definate step up in ratio would help a bunch. Thanks.
     
  2. MTBLAZER89

    MTBLAZER89 3/4 ton status GMOTM Winner

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    4.88 just my .02 in case you go bigger than 39.5

    -Brian
     
  3. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    id go 4:88's or 5:13's but definitely not 4:56's /forums/images/graemlins/shocked.gif /forums/images/graemlins/thumb.gif
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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  5. outlaw612

    outlaw612 1/2 ton status

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    Id go at least 4.88s. Ive got 36's with 4.56's now, and when I get the money, Im wanting to go to 39-42's and 5.13's.
     
  6. Hossbaby50

    Hossbaby50 3/4 ton status

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    I would definitly be looking minimum of 4.88. I run 4.56's and 35's (34" true height) and I am kinda regretting the fact that I didn't go to 4.88's or 5.13's. I do have a 700R4 so I have OD, but I only plan on 38" tires (37" true height).
     
  7. BadDog

    BadDog SOL Staff Member Super Moderator Author

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  8. zakk

    zakk 1/2 ton status

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    5.13's.
     
  9. NE-RokToy

    NE-RokToy Registered Member

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    If you have a motor thats still running strong I would sugest running the 4.88's. i think 5.13 would be a bit much if you ever plan on hitting the highway as those tires are only about 37" tall correct?
     
  10. zakk

    zakk 1/2 ton status

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    nope, i got 5.13's and i pust about 3000 on the freeway.

    the TH350 hated the 4.10's. it only took me 2 transmissions to figure that one out.

    Unless you got a stout BBC, a mild SBC won't generate enuff power to turn those monsters w/o 5.13's.

    My 39.5x15x16.5 TSL's measure 39"
     
  11. NE-RokToy

    NE-RokToy Registered Member

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    [ QUOTE ]
    nope, i got 5.13's and i pust about 3000 on the freeway.

    the TH350 hated the 4.10's. it only took me 2 transmissions to figure that one out.

    Unless you got a stout BBC, a mild SBC won't generate enuff power to turn those monsters w/o 5.13's.

    My 39.5x15x16.5 TSL's measure 39"

    [/ QUOTE ]

    wow the 15" 39 TSL are only like 37" tall on a 15x8 wheel!!!!
     
  12. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    i have a friend that has a ford pickup with 5.13's and 44's... well he always took it through nj inspection and passed.. well they changed their laws..... nj laws that is... so basically he passed with 38's and had to take his body lift off... he left the 12" lift on... so this allowed him to get through... i was talking to him and he said the 5.13's are killin him.. it is a daily driver... he has a f250/automatic... he went to 4.56's and loves it.. he said he can still off road and has plenty of power.... 39.5" boggers are 39.5" so i would say 4.56's cuz i know guys that run 44's with that ratio too... but i wouldnt go past 4.88 if it is a daily driver.. if it is a weekend warrior ...yeah 5.13's or if you trailer it rockwell axles...!!!
     

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