* AOD (Automatic Overdrive): This was a four-speed automatic transmission. It was the more common option.
* T-5 (Manual): This was a five-speed manual transmission. Fewer 1989 GTs were equipped with this.
To know for sure which transmission a specific 1989 Mustang GT 5.0 has, you'd need to check the vehicle's documentation (like the owner's manual or build sheet) or physically inspect the car. Looking under the car for a shifter or checking the transmission identification tag will help determine which type it is.
