However, common fluids used in 1990 Bronco transmissions include:
* Mercon: This was a common Ford specification for automatic transmissions. Many 1990 Broncos used this.
* Type F: Another common Ford specification, but less common than Mercon in that era.
Do not simply assume. Using the wrong fluid can severely damage your transmission. Consult your owner's manual or a reputable parts store (providing your Bronco's VIN is best) to be absolutely certain.