What size speakers are in door of 91 dodge ram truck?

Dodge Ram trucks from 1991 typically used 5 1/4-inch speakers in the doors. However, this isn't guaranteed. Some models or options packages *might* have had different sizes. To be absolutely sure, you should:

* Check your owner's manual: This is the best source of information.

* Remove a door panel: This allows you to directly measure the speaker opening. Be careful when doing this to avoid damage.

* Look for markings on the existing speakers: The speaker itself might have its size printed on it.

Without knowing the specific trim level of your 1991 Dodge Ram, 5 1/4-inch is the most likely answer, but verifying is recommended.