What is the rear end gear ratio of a 1989 mustang with 2.3 4 cylinder?

There's no single answer to what the rear end gear ratio is for a 1989 Mustang with a 2.3L 4-cylinder engine. The ratio varied depending on the options selected by the buyer. Ford offered several different rear axle gear ratios in 1989 Mustangs, and the choice often depended on the transmission (automatic or manual) and trim level. Some common ratios included 2.73, 3.08, and 3.55.

To find the correct ratio for a *specific* 1989 Mustang, you need to:

* Check the vehicle's data plate: This is usually located on the driver's side doorjamb. It might list the axle ratio.

* Look at the differential tag: The differential itself (in the rear axle) often has a tag indicating the gear ratio. You'll likely need to get under the car to see this.

* Check the owner's manual: If you have the original owner's manual, it might specify the axle ratio.

Without knowing the specific vehicle's details, it's impossible to say for sure what the rear end gear ratio is.