Chevy stock gear ratio
Very good question, the only to really know for sure is to look at the differential tag on one of the bolts on the pumpkin housing. They use many different ratios all depending on the calabration code of the rig in question. Some had 350's some had 373's and on. I even saw one that had 534's in it, he said that he had special ordered it that way cause he want a low speed heavy hauler.
Well ik its 10 bolt and its 32 spline
I'm thinking maybe the 3.08 ratio but I'm not sure
I agree with tennisshoes, you never know what you got unless you look. You could look up the vin. number, that would tell you also. Probably the most common ratio is 3.73. One way you can figure an idea of what you have would be to lift up a rear wheel, mark it in reference to a stationary point, the same with the drive shaft, rotate the wheel 1 revolution, and count the turns on the driveshaft. Where ever the drive shaft stops, you'll have to judge how far in a circle the mark ended up at, thus 3=full turns of the drive shaft, .73 is where the mark on the drive shaft ended up in a full circle.
So is the tag missing? If so you can get somewhat of a idea by jacking it up and blocking it then turning both the rear wheels the same direction at the same time watch the driveline rotations and count how many it takes to make 1 tire revolution, it may take a couple of tries to get it, sometimes another person can help but do it slowly and carefully count.
Looking for a Used C/K 1500 in your area?
CarGurus has 820 nationwide C/K 1500 listings starting at $2,436.
Search Chevrolet C/K 1500 Questions
Chevrolet C/K 1500 Experts