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what size tires would be best

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by k5texan, Jan 6, 2002.

  1. k5texan

    k5texan 1/2 ton status

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    i am saving up for tires and wondering should i go taller. i have a 4" lift and 33'' coopers now and stock drivetrain (343 gears i think). would it be best to stay with 33s and get more aggresive or would it hurt to move up to 35s to fil out the fenderwells better. i dont want the bigger tires to effect performance or mpg.
    thanks
    jared
     
  2. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    I'd figure out what gears you have for sure... cuz if you have 3.43's you don't wanna go bigger... in fact you might be even a bit too big tire wise for those gears with 33's.....

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  3. Sparky87k5

    Sparky87k5 1/2 ton status

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    Any tire larger than what you now have will effect performance and fuel mileage. 3.42's aren't very low and for you to run a 35" tire, should go to something in the 4's. Possibly 4.10 or 4.56's. Lot depends on transmission choice too. T350, T400 or 465's will like 4.10's but the overdrive trans will like 4.56's with 35's. Also need to look at what you use truck for. 35's with 3.42's will stress 1st gear in city traffic because of all the stop and go driving but be great for top end cruising on the hiway. Will seem like you're in overdrive.

    87 K5, 427BBC,D60 & 14BFF, NV4500, NP208, TSM disc's,
     
  4. Greenblazer-AZ

    Greenblazer-AZ 1/2 ton status

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    One of the most common mistakes people make is going to larger tires without changing gearing. It might make your truck look cool, but if you plan to wheel you will need the appropriate gearing.

    If you knew the truth, you too would be against marijuana prohibition!
    Blue '74 K5 Blazer Topless W/ 35 BFG Muds
     
  5. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    my friend had 3.08s and 35"s for years. and never really realized how bad that was til he found this site. we just put 4.56s in his jimmy like a week ago. now that truck is awesome! i have 3.73s and 36"s but i'm doing a gear swap this spring.

    --Scott, 1989 GMC Suburban 2500 4" lift, 36" TSLs
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  6. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    3.42 is hella low for 35s...I run 4.56s with my 35"s and it works well. I'd stick with 33s if I was you, unless you plan on building up to bigger/better things and are going to install new gears anyway.

    J


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