[kieth]

I am new here but have become pretty involved in the 67-72 forum, but have a 66 gmc. On that board lots of folks are changing transmissions, rear ends, engines, and tire sizes and they were only looking at speed. I have built a set of excel spreadsheets that show most available engines, transmissions, rear axle ratios, and differing diameters of tires. What this lets you do is know how fast your vehicle will run and how much power it will have before making the change.........I use about 460ft/lbs of torque to the ground in OD gear as kind of a yard stick, and also shoot for 2000rpm cruising down the road at approximately 65mph. I am going to try and post one of these excel spreadsheets here so you can get an idea of the information that is available:


oh well that did not work, will try again: