Since you haven't mentioned your rear gear ratio, I'll assume your truck was originally a small block with automatic...
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the formula for determining the proper gears for any application consists of multiplying the rear axle by 20.2, and dividing that number by the tire diameter. (rear axle x 20.2 / tire diameter)
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Taking that formula...and my assumptions of your present gearing... we'll take 3.07 X 20.2 which comes out to 62.014. Now divide that by your 28 inch tall tires, and we get 2.21485714. Lets just call that 2.21.
Looking at the chart, there's a few ways to get the 2.21.