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what do I need?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by possum, Jan 10, 2002.

  1. possum

    possum Registered Member

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    I'm fairly new to 4x4's. I have a '78 blazer, 350, th350/np203, 4" lift, 33" M/T tires. I have a 12b rear and a 10b front with I'm guessing 3.08 ratio. It's a daily driver but my daily may only include 6 miles a day 4 days a week and on occasion I'll make a 20 mile trip to the "open til 9pm parts store". I want good pulling and towing ability and will probably go to 35's when I get new tires. I'm building it for off road ability and to heck with gas mileage. It's a ways down on the list. What gear ratio would I need. I'm thinking 4.56, but I don't really know squat about it.
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I would go with 4.10's...you don't have OD and I'd think the RPM's on the freeway would be kinda high with the 4.56's.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
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  3. mudhog

    mudhog THEGAME Staff Member Super Moderator

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  4. Wheels

    Wheels 1/2 ton status

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    Yep what Rene said. I went to 4.10 and 33's and the rpm's at 70 mph was 3300. A 700R4/NP205 transplant cured that (I commute 25 miles one way to work and drive 90 miles to one of my wheeling areas and 300+ to others). You will find that when you swap out the 3.08 to 4.10, you will get a better low range on the t-case.
     
  5. m j

    m j 1/2 ton status

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    4.56 will put you at 2800rpm cruising at 60mph IF your tires measure a true 33" tall.
    i wouldnt do it, i have 4.88s and 39" tires and the cuise rpm is higher then i like

    formerly 77chev
    still a jerk though
     
  6. NoSmog73

    NoSmog73 1/2 ton status

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  7. RaisedK5

    RaisedK5 1/2 ton status

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    Clicky : <a target="_blank" href=http://www.geocities.com/MalibuNirvana/technical/tire_diameter/RPMCalculator.html>http://www.geocities.com/MalibuNirvana/technical/tire_diameter/RPMCalculator.html</a>

    Leland aka RaisedK5

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