What size speakers are in the rear door of a 99 F-250?
The rear doors on a 1999 Ford F-250 typically use 5x7-inch speakers, with 6x8-inch units found on some trims or premium audio setups.
In the late 1990s, Ford offered a range of audio configurations for the F-Series, and rear-door speaker sizes could vary based on cab style (regular vs. extended cab) and the chosen sound system. For anyone upgrading or replacing blown rear-door speakers, pinning down the exact size for your specific truck is essential to ensure a proper fit and sound quality.
Common rear-door speaker sizes
The following sizes are most commonly reported for 1999 F-250 rear doors. Availability depends on trim and factory audio package.
- 5x7 inches (127 mm x 178 mm)
- 6x8 inches (152 mm x 203 mm)
Note that actual fitment can vary by cab configuration and equipment. When in doubt, measure the speaker opening or consult OEM documentation for your exact VIN.
How to verify the exact size on your truck
Use these steps to determine the precise rear-door speaker size for your 1999 F-250 before purchasing replacements or upgrades.
- Carefully remove the rear door panel to access the speaker without damaging clips or wiring harnesses.
- Measure the mounting hole diameter and overall speaker diameter to confirm whether the opening is 5x7 or 6x8 inches.
- Check the existing speaker for part numbers or markings that indicate size and impedance.
- If possible, consult the vehicle’s VIN-specific service information or Ford's official parts catalog to confirm the original equipment size.
With the exact size known, you can select a replacement that fits properly and preserves audio performance.
Additional considerations
Impedance and wiring: most factory speakers from this era are typically 4-ohm nominal. When replacing, match the impedance to the rest of the system and ensure compatibility with any factory amplifier or head unit. If your truck has an upgraded sound system or an external amp, verify wiring harness compatibility and consider using adapter adapters if needed. Professional installation can help ensure optimal fit and sound integrity.
Conclusion
In short, the rear-door speakers in a 1999 F-250 are commonly 5x7 inches, with 6x8 inches appearing on certain models or audio packages. To be certain, measure the opening, check the existing speaker, or reference OEM documentation for your specific vehicle configuration. Accurate sizing helps ensure a clean install and reliable sound performance.
Summary
The bottom line is that 1999 F-250 rear-door speakers are typically 5x7 inches, with 6x8 inches also found on some trims. Verify the exact size on your truck by measuring or consulting OEM documentation, especially before buying replacements or upgrading the system.
