[lukecp]

Once again, thanks for the help. I'll check the tag next time i look see the truck, if the tag is still there.
Another thing i was suprised at is that the frame on the C20 looks no thicker or no taller than the frame on my C10. Only difference i can see are stiffer springs, 8-lug wheel pattern, and the much beefier rear axle.......
Also, with 31" tires (which the truck has), online caluclators put it at 3460rpm@70 with 4.56 gears and 3111rpm@70 with 4.10 gears...