Depends on the rear axle the car has. 10 bolt is most likely 8.25" for a 1968, but 8'5" is also possible. 12 Bolt is 8.875".
8.2"
That all depends on the rear gearing in your car and the size of your engine.
The size of the front ring gear in a 1992 Chevy pickup is 7.5 inches. The 7.5-inch ring gear needs a 26 spline axle shaft.
These cars came with a 10 bolt, 8.5" ring gear and an optional 12 bolt 8.875" ring gear.
8.5"
8.6
Count the # of teeth on the ring gear. Now count the # of teeth on the pinion gear. Now divide the small # into the big # and that will be your gear ratio.
Ring gear size is 8.5 inch , 28 spline axles .
You MUST buy a positive trac unit / carrier that will fit the size ring gear that is in the truck now. Then HAVE it installed by a person THAT KNOWS WHAT THEY ARE DOING
Do you mean gear ratio or rearend size?
The # of teeth on the ring gear and the pinion gear. There is always more teeth on the ring gear then the pinion gear. And the way you determine the gear ratio is devide the # of teeth that's on the pinion gear into the # of teeth that's on the ring gear and that will be the gear ratio. The 4 gears that are the same size and run together is called the spider gears. Do not count those gears they have nothing to do with the gear RATIO.
To determine your diff ratio, remove the cover, count the teeth on the ring gear, then count the teeth on the pinion gear. Divide the ring gear number by the pinion number.