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!!! tire / gear size !!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by lifethroughdeath, Mar 16, 2003.

  1. lifethroughdeath

    lifethroughdeath 1/2 ton status

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    (posted in G1 forum accidentally) ive had my '90 K5 for about 2 months now and its all stock, (FOR NOW!) way too much i want to do to her in the future. with no lift on the tire size chart it says you can use a 31" tire without any problems, and a 32" with minor trimming, would i have any drivetrain related problems (overheating my auto 700r4) if switching to either of these without changing my stock diff gears, these are only going to be temporary until i can afford a lift and bigger tires and EVERYTHING else on my LONG list of mods, but for now my tires are BALD /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/k5.gif
     
  2. MJF

    MJF 1/2 ton status

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    Well you didn't give aus a whole lot of information to go by, but I think you should be able to go to a 31-33 without re-gearing. If you have big plans for the truck, you don't want to regear before you ned to. It costs approx $500 per axle for a shop to regear.

    What is your gear ratio now? 3.08? 3.73?
     
  3. lifethroughdeath

    lifethroughdeath 1/2 ton status

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    i have no idea what gears i have, i just wanted to make sure that the 32" tires would give me no problems with anything on my truck, how bad will a 32" tire rub on a stock height 90 K5, only at full turn /forums/images/graemlins/1zhelp.gif
     
  4. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    I used to have 32's on 10" rims and they never rubbed.
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    Had 32x11.5R15s on stock 1983 K5, 15x8 wheels, and they never rubbed.
     
  6. rebelk5frk

    rebelk5frk 1/2 ton status

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    I got 32x11.50's on 10" rims. The first tires I had never rubbed. My BFG mud terrains used to rub only on compression while turning. After a little problem I had with an unexpected 4 foot drop they would rub all the time when turning but only a little.

    It really depends on if your springs are saggy or not. Either way if you do rub it won't be by much and you should be ok.

    I now have a lift so no more rubbing for me until I get new tires.
     
  7. Madbomber88

    Madbomber88 1/2 ton status

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    I have 32x11.5 on my otherwise stock 90 (stock aluminum rims) as well and it doesn't even come close to rubbing. I have 3.55 gears and they work great, cruises 70 on the highway barely reaching 2200 RPM.
     

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