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No offense intended, and none assumed. All's good in my book! We're all just trying to help were we can.

Gary,
The ones I've seen on the generic calculators don't let you consider overdrive, nor do they give you the flexibility to run all of the tranny gears in one place and see the shift points. I...

I built a little excel spreadsheet to plug in my tranny gear ratios including OD, rear tire diameter, rear gears, and left cells open to plug in speed to determine cruise rpm, and rpm in each gear...

I had no idea that you could get both 3.73 (41Ring, 11Pinion) and 3.75 (45Ring, 12Pinion) for the same carrier sizes. I thought that they picked one or the other for a given rear differential. ...