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    1979 GMC 1-ton dually 7,4 stock cam specs

    Hello from the Central Coast of California; I'm having trouble finding a stock grind camshaft for my 454. I own a 1979 GMC C-3500 Sierra Grande with a T-400, and I think the rear gears might be 4:10 or could be 3:73. I'll have to raise the rear to check because the tag on the diff case is so...

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