Speed, engines, torque to ground

[kieth]

Attached is the spreadsheet which I have been emailing to anyone who needs information about gearing, transmissions, rearends, and tire diameters.
I initially developed a simalar chart when I was a Salesmen for Freightliner. Engines were changing, new transmissions were being introduced, tires sizes were getting smaller to allow more height, and on top of that the speed limits were also changing.

I had previously been a sale engineer for Tulsa Winch and sold mechanical power transmission equipment. We had to help our customers figure out how to gear our products to have enough torque within a usable range of speeds (chain and sprocket via a Pto on a truck)

Using the same formulas and backing into some other numbers I built a book which showed all the different engines, transmissions, rear ends, and tire diameters that were used at that time and then put that information into a spreadsheet that show usable torque to the ground at different rpms (100 rpm increments)

I attempted to do the same thing with our trucks and the engines that we see being used most often.

I use this sheet to look up a combination of engine, trans, R/A ratio, and tire diameter that I know how it performs.

i.e. my 66 GMC has a Throttle Body Injected 350 with a 700r4, 3:73 rears, and 31" rear tire diameter. The truck works great in 1, 2, 3rd and in 4th cruised down the highway at 66mph at 2000 rpm, it is not a race truck but it does very well and I am happy with it. this combo has 442ft lbs of torque to the ground in OD........so we use that as a benchmark and also as the bottom of the torque to the ground number to make sure the trucks can pull themselves down the road.
Look at how much torque your truck had with the original engine and then compare that to how much it has with the new engine/trans/ etc that you want to put in the truck. This will give you a quantifiable number to compare to before you set your truck up.

Good luck with your build .......Kieth Tulsa, Ok send me a pm if you want to talk about this in more detai and I will send you my phone number....ps I do not sell anything......

Well it did not work, will try again tomorrow.......Kieth