look for an id tag on the axle. if it doesn't have one take the cover off the differential and count the teath on the ring and pinion gears(big circle and small gear biting into it) then use simple division ex. 16 on the pinion and 44 on the ring equals 4.11
NEW ANSWER; He's right about counting teeth on gears, But you need to divide
the # of teeth on pinion gear into the # of teeth on ring gear, and round off #
That will be your gear ratio for sure.
A ring gear of 40 and a pinion gear of 13 is a 3.08 (40/13=3.0769...)
You can waste your time taking the dif cover off or you can do it the old fashion way. The easy way to figure it out is to jack the vehicle up off the ground put the trany in neutral and rotate the tire one full revolution and while doing so count how many revolutions the drive shaft turns. For example if you have a 4.11 rear gear ratio the drive shaft will spin 4.11 times for every single tire rotation.
It is a good idea to mark the back side of the tire where it is closest to the ground with some masking tape. That way you can see when you have made one full revolution as well as putting a mark on the drive shaft and axle housing. Not only is this easier it is alot cheaper than buying new diff lube and a gasket for the axle housing.
You can refer to your user manual to ID the rear end gear ration in 80 Chevy pickup.
It depends on the gear ratio of the rear ends. You can find this out in the glove compartment of your truck. It should tell you there. Hope this helps you out.
3.42
Keep it tuned, add an aftermarket air filter such as K&N, change the rear diff gear ratio,
3.08
The rear gear ratio of a 1989 Chevy Cheyenne truck is between 2.73 and 4.56. This is the number of times the drive shaft rotates in relation to the tires.
The stock gear ratio for a 1995 Chevy Blazer is 3.73. This provides a good balance of fuel economy and power to the rear wheels.
4:11 gear ratio
If your asking about the gear ratio, Then write the VIN # down and call a Chevy dealer and ask for parts. Then ask the parts man if he'll tell you the gear ratio and that you have the VIN# on you truck. He'll tell you what the gear ratio is from the factory.
If it has stock-type tires, a 3.08 should work good for economy, and a 3.50 for power.
i believe it would be 3.11
Same as the rear.