Factory Size: The factory speakers in a 1994 Dodge Ram 1500 are *typically* 6x9 inches in the front doors. However, some models might have had different sizes, and some owners may have already upgraded.
Aftermarket Options: You can often fit larger speakers with some modification. Many people successfully install 6x9" speakers, or even slightly larger, with custom mounting brackets or adapters. However, you'll likely need to do some work to ensure a proper and secure fit. Going much larger than 6x9" will probably require significant modification, potentially cutting into the door panel or even fabricating custom speaker pods.
Recommendation: Before buying speakers, remove one of your door panels and carefully measure the existing speaker opening. This is the only reliable way to determine the maximum speaker size you can fit *without* modifications. Then, you can choose speakers that fit that space or plan modifications if you wish to install larger ones.
