[leddzepp]

Easy to figure out both posi, and gear ratio:


Jack the truck's back end up. Spin the tires. If they both spin in the same direction, you have posi. If they spin opposite of each other, you do not have posi.

Figuring out your gear ratio is easy. Attach one lug nut on one of the wheel studs for reference. I put it in the 12 o'clock position. You can mark a spot on the driveshaft for reference, or use the pinion yoke for reference if you do not have the driveshaft attached. If your driveshaft is attached, your trans will need to be in neutral. Turn your driveshaft and count the number of times it takes for that lug nut to reach the 12 o'clock position again. Mine took 3 3/4 turns, so I have a 3.73
If it takes 3 turns, you have a 3.07, 3 1/2 turns you have a 3.43 (unlikely), 4 turns, you have a 4.10, and so on.....