Well we could never get my Excel Spreadsheets to post on this forum, always said the PDF files were too big. Yesterday I posted them to another Forum (GMC owners) So if you need to see this information go here see post 6 and 7 the spread sheets go from 24 to 32" tire diameters and most common engines, transmissions, and rear axle ratios. If you need a custom chart PM me here and I will email you one like we did before. Kieth
ps guidelines are minimum 460 ft/lbs of torque shoot for 65mph @ 2000 rpm this will keep you from building a truck that cannot get out of its own way.
http://6066gmcclub.com/forum/showthread.php?t=48090