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i have a 1978 chevy k10 3/4 ton 4x4 i,m putting a 3" body lift on it.can any one tell me what are the biggest 15"tires i can put on it with out cutting the finders down. i would like too put 35x12.5x15..it,s still stock and i have 33x11.5x15" on it now. thank you...
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You need 4" of lift to clear 35x12.5's without rubbing. Technically you shouldn't be able to clear 33's on a stock truck. Have the fenders been clearanced?
Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project
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I currently have a 79 3/4 Ton 4x4. It is stock and it also clears 33's.
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Ensure your rear axle ratio can handle that size tire. If it is a high gear rear, you may want to lower your ratio. Large tires make a big difference in rear end ratios.
SgtDel
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Yes, that is true. I have 3.08 posi's in my 78k10 and that poor thing will barely go up a hill and hold speed with the 33's on it. 3.42 will do fine, 3.73's are better, but 4.10's are... dare I say it, God-like. Hope gas milage is of no consequence.
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I have a 91 sub w/ 33's on her. The rear is a 3:73, which, with those larger tires, translates to close to a normal set up 3:08 rear, when you look at the rpm's.
SgtDel
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My 78 has 38.5"s on it with 4.88 gears. A little too low sometimes, but with 3.73's it was a total dog. It now gets up to speed like it should, but runs around 3200 Rpm's at about 65 mph. Gas mileage is terrible! Big trucks drink the gas!