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opinion: would you swap from 3.07 1/2 ton to 4.56 3/4 ton or to 3.73 3/4 to

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by R72K5, Sep 20, 2002.

  1. R72K5

    R72K5 Banned

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    Location:
    central IL
    i have a 14 bolt FF 3.73 and a 4.56 dana 60 FF rear

    i want to put either one under the 79 K10

    what do you think would be ideal for a truck thats only really ever gonna see streets and never rocks or hills, and maybe occasional muddy hill at creek banks ?

    1. dana 60 4.56 with locker
    2. 14 bolt FF with 3.73 no locker

    also what i choose will depend on what ratio is easier to find for dana 44 axles, i see alot of 3.73 from factory especially on the 69-72 blazers since that ratio was std equipment anyways

    do carriers differ on dana 44 ?

    thanks for anything
     
  2. k5ntexas

    k5ntexas 1/2 ton status

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    well what size tires are you going to run? that makes a big difference /forums/images/icons/smile.gif

    jacob
     
  3. Hossbaby50

    Hossbaby50 3/4 ton status

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    For a street truck I would say 3.73. I had 3.73's and they where fine for my truck on the street and moderate offroading. I now have 4.56's and they are a little to low for the street. (i am running 32's currently, but I do have OD) When I get my 35's or 37's it should be better for street RPM & mileage wise
     
  4. R72K5

    R72K5 Banned

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    gonna run big tires since i have lower ratio i can put in now.
    im probably gonna opt for the 3.73 because of gear sets of higher ratios being stronger due to larger pinion gear head and lil lower rpm on cruising, but that has to do with tire diameter of course.

    technically i dont really have any reason to have 4.55/4.57 in the truck, 3.73 should be plenty for a street truck and still could cruise pretty ok on street with taller tires. im thinking around 38-40 or so diameter, dunno yet, wont know il its time for tires,,
    depends on what i can find, wont have much variety at all around here, no one around here has trucks and does this stuff, extremely rare incident to spot a jacked up large tire truck.. any that are have an el camino body or some kind of car body installed on chassis.

    thanks
     
  5. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Re: opinion: would you swap from 3.07 1/2 ton to 4.56 3/4 ton or to 3.73 3/

    for a non OD truck.
    3.73 for 33's is a fair combo. 4.10 for 35's is a fair combo. 38- up...4.56 for shure or you going to smoke the tranny and be such a dog off the line you will hate it. Check here and click the engine rpm link on the left. It will figure your engine RPM.
    http://www.ring-pinion.com/calculators.shtml
     
  6. mudober

    mudober Registered Member

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    I like the Dana 60
     
  7. RESTORE89

    RESTORE89 1/2 ton status

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    Re: opinion: would you swap from 3.07 1/2 ton to 4.56 3/4 ton or to 3.73 3/

    i agree if you 38 or up tires woul highly rec at 456. i run 410 with 33, but i have od
    at least you dont have a 700
     

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