Re: Rear end gears
you can get a general idea this way: jack up the rear end. Make a line on the pinion yoke and onto the rear end with chalk or a grease pencil. Do the same to the tire on the truck, so you can see when the tire has rotated exactly one turn.
Now count the number of turns of the driveshaft that it takes (use your chalk marks) to make the rear tire turn one complete rotation. (Transmission needs to be in neutral or out of gear.)
four turns on the drive shaft to one of wheels, is something like a 4.10 ratio
my '63 3/4 ton has a 4.56
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