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The best of that body style is a '91 2500 series. That gets you TBI and the 4L80E tranny with an NP-241 hanging off the back of it. /forums/images/graemlins/cool.gif
As I posted many days ago I just bought an '03 2500 Suburban with a 6.0 (wish I had the 8.1). Gas mileage has been crap (which I knew) and the truck has 245 tires. Turns out the axles are 4.10. YEAH. Now Im gonna throw on some 285 and hope the gas mileage gets better.