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4.56 or 4.88?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CarolinaBogger, Sep 27, 2001.

  1. CarolinaBogger

    CarolinaBogger Registered Member

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    I know some of yall have some experience with this: I am planning on putting some 38"s on and was wondering which gears would be better: 4.56 or 4.88's. I have 4.10's with my 35"s and like that setup. One guy told 4.88's would be better. I have the stock 350 TBI. I am concerned about over-working the transmission with 4.56's. What do yall think?l
     
  2. DesertDueler

    DesertDueler 1/2 ton status

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    What tranny are you running? Also what axles are you running? If you have a 700r4 or 460LE tranny then I would reccomend the 4.88s. But if you are still running your 10 bolts front and rear you dont want to go any bigger than 4.56s. The reason is if you any bigger than 4.56s in a 10 bolt, the pinion gets too small and is very easy to break.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  3. CarolinaBogger

    CarolinaBogger Registered Member

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    I'm running a 700 tranny and a 12 bolt 8.875" rear and the stock 10 bolt front. I've heard the same thing about the small pinion vulnerability, but is the 12 bolt 4.88 pinion a lot stronger?
     
  4. The85k5

    The85k5 1/2 ton status

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    hey when you pop out those 4:10's u wanna sell em? cuz i'll buy them!!!! 3:08's and 35's just aint cuttin it

    Damn curbs always hitting em...oh wait that was a car?
     
  5. CarolinaBogger

    CarolinaBogger Registered Member

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    Sure, but there is a small chip on the reverse side of a tooth. It's never given me any problems though. Remember, it is out of a 12 bolt. I also have a 10 bolt 3.73 r&amp;p that is only about 8 months old.
     
  6. DesertDueler

    DesertDueler 1/2 ton status

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    The 12 bolt pinion is stronger, but dont go any bigger than 4.88 with a 12 bolt.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  7. Brian 89KBlazer

    Brian 89KBlazer 1/2 ton status

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    I'd go 4.88 with the 700R4. You have the overdrive to keep revs down &amp; the lower gearing will give you better starting power to get those big tires rolling.
    Just make sure you're sticking with the 700R4. I bought a D60/14 with 4.88's to go with a 700R4 &amp; in the end; I got a TH400 w/out OD so now my gears are a little high but still ok!

    Brian
    89KBlazer

    Build it Right or Don't build it at all!!
     
  8. txbartman

    txbartman 1/2 ton status

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    I have 4.56s with 35s and a 700. I am very pleased. But I would recommend 4.88s with your 38s and the 700.

    Brian
    A new day.... May God be with us all.
    <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Tribute</a>
     
  9. mudhog

    mudhog THEGAME Staff Member Super Moderator

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  10. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I'd go 4.88 or lower. I'd consider going lower anyway.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     

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