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 have 89 Chevy extended cab pickup 350ci 700r trans i would like to know the rearend gear ratio and if 89 3/4 ton rear would help tow 6500# camper have replaced leafs with 3/4 springs seems original rear geared to high trans gets hot
Need to remove the rear end plate. Then count the teeth that is on the ring gear ( big gear ) and write it down. Now look up inside of the housing and you will see another smaller gear that runs in the big gear, That will be the pinion gear, count those teeth now. Now take this # and devide it into the first # you wrote down and this will be the gear ratio. You will have to jack it up and take it out of gear, so you can turn the gears to be able to count them.
i believe it would be 3.11