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35" tires - do you think this is a good idea?

Discussion in 'Chevy Trucks' started by 78K20, Dec 14, 2004.

  1. 78K20

    78K20 Member
    from WV
    Messages: 49

    I have a 78 chevy K20 with a mild 350 bored .60 over,rebuilt th400 and trans cooler, Coporate 10 and 14 bolt axles with 4.10 gears, rear auburn gov lock,an NP203 transfer case with a part time kit and 33" tires. I heard that this effectively makes my gear ratio 3.73 with 33" tires. I am happy with the way the truck accelerates and it has plenty of power for towing and plowing. I still get about 8 to 10 mpg in town and 11 to 12 highway mpg which is to be expected. The thing is I want to put a 2 inch add a leaf and 35" tires. Will they fit without rubbing? Will this lower my gear ratio lower and get me better gas mileage since I drive on the interstate alot. Or will the increased rolling resistance lower the gas mileage even more? Will 35" tires be harder on my drive train especially my transfer case? I just put a the trans in and out 4 times ,until it was right, at my apartment where i go to school... long story :realmad: How much power will I lose? I noticed a slight loss in power when I went from 31" to 33" but my gas mileage increased about 2 mpg. sorry for the long post I have been thinking about this for a while now since I will be needing new tires soon Thanks for the help :salute:
  2. Tarkus

    Tarkus PlowSite.com Addict
    Messages: 1,113

    In a nut shell you have no overdrive so you have to gear a bit differently that a truck with OD. 4.10 with 35's is ruffing equal to 3.42's with 30's. A jump to 35 will likely lower MPG and performance because of taller yet raitio and increased drag and rolling resistance and a little more added tranny strain too. If 33's are working for you you should leave it as is, at least for the winter anyway.