Chevy stock gear ratio

Asked by Mar 03, 2016 at 01:05 PM about the 1990 Chevrolet C/K 1500 Standard Cab LB 4WD

Question type: Maintenance & Repair

What is the stock gear ratio on 1990 Chevy
Silverado 1500 4x4 with the 350 engine

5 Answers

78,305

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.

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Best Answer

Well ik its 10 bolt and its 32 spline

I'm thinking maybe the 3.08 ratio but I'm not sure

37,965

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.

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78,305

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.

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