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gears

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by waterboy, Aug 2, 2000.

  1. waterboy

    waterboy Registered Member

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    i was wandering what size gears i would need to run forty inch swampers on a 10 bolt front end and a 12 bolt reaer end. or if any of you all are selling some or know where i can get some for cheap. Please bair with me im just starting im seventeen and no one is helping me but you guys. any help would be greatly appreciated thank you very much
     
  2. bigdaddy89

    bigdaddy89 1/2 ton status

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    I think you would be wasting your money putting in any type of gears with the size of tires your are going to run. You will blow them up. I think 36's is about the biggest to go with 12 and 10 bolts. If you went with 35's, then 4.56 gears would work out well for you.
     
  3. ggallin13

    ggallin13 1/2 ton status

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    The question to ask yourself is: "How fast do I want to travel ten feet?" You need way bigger axles to run tires that big. Do you have to have tires that big? 35s are perfect, in my experience, and with 4.56s it is wonderful.
     
  4. waterboy

    waterboy Registered Member

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    wel what size rear end and front end would i need and how much would it cost and where can i fined them thank you
     
  5. SAVAGE1

    SAVAGE1 1/2 ton status

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    <font color=blue>How much do gear swaps usually cost? I want to run 4.56s. I have a stock 85 with 33's and it seems that my 350 is struggling sometimes. I know I'm going to end up with 35's but I need to change the ratio. What is a fair price (parts/labor) so I don't get ripped off. Thanks guys.

    RoD
    </font color=blue>

    BLAZE IT UP!!!
     
  6. 90K5

    90K5 1/2 ton status

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    You would need a 14 bolt rear and Dana 60 front. And 4.56s are better for 35s and 4.10 are good for 33s

    90K5
     
  7. 6.2Blazer

    6.2Blazer 1/2 ton status

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    In my personal opinion, you could "get by" with the existing axles and the big tires if you mostly drive on the street and don't run it very hard. Also, I know huge tires look cool but there is an awful lot of money required to properly set up a truck to run tires that big, plus the on-road ride and handling usually are not very good. I'm really not trying to discourage you from doing what you want, but maybe consider starting out with 35's or 36's first.......
    For the cost to do a gear swap on one axle, I payed around $200 for the gears, all new bearings, and misc setup parts and about $150 in labor.
     
  8. waterboy

    waterboy Registered Member

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    how much would a 14 bolt rear and a dana 60 front run me and where cna i fined some and is it possible to get theme with the gears i want
     
  9. Scoobydoo

    Scoobydoo 1/2 ton status

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    Phoenix / Peoria ARIZONA. (75thAve/DeerValley)
    14 bolts usually come with 3.73's or 4.11's and some had 4.56's you may find a used 14 bolt with 4.11's or 4.56's for about the same price as re-gearing your 12 bolt!
    But any FF 14 bolt is going to be an 8lug not the 6lug so you will need new wheels as well. so look for a SF 14 bolt so it will have the 6 lugs (alot of 88 and newer 3/4 ton trucks have these)
    Do you know what gears you currently have? I ran a 78 with the same axles as yours with 4.11's and 36.5" grandprix tires and never had a problem and it had enough power and no breakage. But I agree with what everyone is telling you, if you do need to re-gear, you may as well swap the axles
     
  10. Cornfed-90K5

    Cornfed-90K5 Registered Member

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    I just put in 4.56's and I love them they are perfect with my 35" tires.

    Cornfed-90K5
    1990 K5 Blazer
    1977 Jeep CJ5
     
  11. 89K5

    89K5 1/2 ton status

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    Hey Cornfed-90K5, how are your rpms on the highway. I need new gears, but I'm thinking that 4.56 might be too much for highway driving everyday (60 miles).
     

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