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Differential Gear Ratio Question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Blaize, Jun 28, 2001.

  1. Blaize

    Blaize Registered Member

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    Location:
    Torrance, California, USA
    I'm running Mickey Thompson 36x14.50x15 with the original 3.08:1 gears in both differentials.... OUCH ! Needless to say, it really sucks ! So, I've been researching the topic and seem to think 4.56:1 will be good. Yes, it's my daily driver and rockcrawling/mud-bogging/trail-loving rig, so I'm not looking for gas-milage, but rather better power.

    My biggest question is: " Will my transmission 'overdrive' feature work well (on freeway) with 4.56:1 gears" ????

    Some of you guys discussed this with me back on the Cleghorn / Silverwood Lake trip (4/1/01), but I've forgotten now what you suggested... sorry !

    Please help me out, I'm getting close to "Add to Shopping Cart" mode !

    Blaize
     
  2. Executioner

    Executioner 1/2 ton status

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    Temp. Ft. Walton Beach Fl. home=Tucson, Az.
    Depends what speed your planning on going, I'd say try to keep the engine rpm in the range of 2,000 to say
    2250 rpm at say 65-70 MPH. That way your tranny will not be trying to downshift to much, and still give you
    the capacity to drive faster if your crusing in another state where they drive faster than where you currenly are at.
     
  3. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Yes, everything will work except your speedometer. I changed from 2.73 to 4.10 with no problems with overdrive.

    If you've got a 700R4, 4.56s or even 4.30s will be great! 4.10s and 36s won't be so wonderful, but it'd be a lot better than 3.08s. You'll never believe the difference when you change the gears!

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  4. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    Sounds good to me. I used 4.10 cause I don't have overdrive. I have 35 BFG's. It works well for me. But 4.56's would be cool.

    '83 GMC Jimmy 4x4 ZZ4 Crate Motor
    '83 Chevy P/U 4x4 Sand Drag Racer, 578 RWHP
    '94 Impala SS
    '01 Chevy 2500HD w/8.1L & Allison Auto
     
  5. walt88

    walt88 1/2 ton status

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    I like the litttle happy face waving. I thinks its cool [​IMG]

    1988 K5- Piss on Ford/Dodge/Jeep
     

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