1998 Ford F150 Speaker Size – The Complete Fitment And Upgrade Guide
The 1998 Ford F-150 typically uses 6×8-inch speakers in both the front doors and the rear cab corners, though 5×7-inch models are also a direct fit. This guide provides exact dimensions, mounting depth considerations, and step-by-step instructions to help you overhaul your truck’s aging audio system with professional results.
If you still have the factory speakers in your tenth-generation F-150, you are likely dealing with muddy bass, distorted highs, or total silence. These trucks were built to last, but the paper-cone speakers Ford installed back in the late nineties simply weren’t designed for a twenty-five-year lifespan.
Replacing your audio gear is one of the most rewarding DIY projects you can tackle on a weekend. By knowing the exact 1998 ford f150 speaker size, you can avoid the frustration of ordering parts that don’t fit and get straight to enjoying crystal-clear music on your next drive.
In this guide, I will walk you through the technical specifications, the tools you need to keep in your garage, and the nuances of different cab configurations. Whether you have a Regular Cab or a SuperCab, we have the data you need to succeed.
Understanding the 1998 ford f150 speaker size and Factory Layout
Ford kept things relatively simple for the 1998 model year. Regardless of whether you are driving a base XL, a well-equipped XLT, or the premium Lariat trim, the speaker dimensions remain consistent across the board. The standard 1998 ford f150 speaker size for all four main locations is 6×8 inches.
While 6×8 is the native size, you will often see 5×7-inch speakers listed as compatible. This is because most aftermarket manufacturers design their 5×7 and 6×8 speakers with a multi-hole mounting bracket that fits both footprints perfectly. You do not need to drill new holes if you choose either of these two sizes.
It is important to note that while the “size” refers to the cone and frame, the mounting depth is the secret variable that often trips up DIYers. In the front doors, the window glass slides down directly behind the speaker magnet. If you buy a speaker that is too deep, your window will hit it, potentially shattering the glass or ruining the speaker.
Front Door Speaker Specifications
The front doors house the primary soundstage for your F-150. These locations are designed for 6×8-inch drivers. You have approximately 2.8 to 3 inches of mounting depth to work with before you interfere with the window regulator mechanism.
If you decide to go with high-end component speakers (where the woofer and tweeter are separate), you will need to find a creative spot to mount the tweeter. Many owners choose to surface-mount them on the A-pillars or the upper door sail panels for better imaging.
Rear Cab Speaker Specifications
The rear speakers provide “fill” sound and are also 6×8 inches. In a Regular Cab, these are located in the pillars behind the seats. In a SuperCab (Extended Cab), they are located in the rear side panels or the small rear-opening doors, depending on the specific manufacturing date.
Rear locations generally have more depth than the front doors, but it is still wise to stick to standard 6×8 dimensions. Because these speakers are closer to the passengers’ ears in a SuperCab, choosing a coaxial speaker with a pivotable tweeter can help aim the sound upward toward the cabin.
1998 ford f150 speaker size: Cab Configuration Differences
While the 1998 ford f150 speaker size stays the same, the way you access them changes based on your cab style. Ford produced the 1998 model in two primary configurations: the Regular Cab and the SuperCab. Each requires a slightly different approach to the teardown process.
Regular Cab owners have it the easiest. The rear speakers are tucked behind plastic trim panels next to the bench or bucket seats. You usually only need to pop a few plastic clips and remove the seatbelt anchor to get enough clearance to swap the drivers.
SuperCab owners have a bit more work to do. If your truck has the three-door or four-door configuration, the rear speakers are mounted inside the rear doors. You will need to remove the entire interior door panel to reach them. This involves removing hidden screws behind the handle and the window switch plate.
Regular Cab Rear Access
To reach the rear speakers in a Regular Cab, start by moving the seats as far forward as possible. You will see a large plastic trim piece covering the rear corner. Use a panel removal tool to gently pry the clips away from the metal body of the truck.
Be careful not to lose the metal “spring clips” that often fall off the plastic tabs during removal. If they fall into the body cavity, they can cause annoying rattles later on. Once the panel is loose, you can reach the four screws holding the 6×8 speaker in place.
SuperCab Rear Access
In the SuperCab, the rear speakers are often behind a grille that is integrated into the door panel. Do not try to pry just the grille off; you will break the plastic. You must remove the entire door panel. Look for a screw hidden behind the latch handle and another near the bottom of the panel.
Once the screws are out, lift the panel straight up rather than pulling it toward you. Ford uses “hook and slot” style fasteners on these rear doors. Pulling too hard outward will snap the plastic hooks, making it impossible to reattach the panel tightly.
Essential Tools for a Successful Speaker Swap
You don’t need a professional shop to handle this, but having the right tools will prevent you from stripping screws or scratching your interior plastics. I always recommend a dedicated nylon trim tool kit over a flathead screwdriver.
- Phillips Head Screwdriver: For the main door panel and speaker mounting screws.
- 7mm Socket and Ratchet: Ford used 7mm bolts for many of the internal brackets and some speaker mounts.
- T50 Torx Bit: Needed if you have to remove seatbelt anchors in Regular Cabs.
- Wire Strippers and Crimpers: If you aren’t using plug-and-play wiring harnesses.
- Nylon Pry Tools: To pop door clips without marring the paint or plastic.
I highly suggest purchasing Metra 72-5600 wiring adapters. These adapters plug directly into the Ford factory harness and then slide onto the terminals of your new speakers. This prevents you from having to cut and splice the original wires, which preserves the resale value of the truck and prevents wiring shorts.
If you choose to splice the wires anyway, remember that Ford’s color coding can be confusing. Typically, the wire with the black stripe is the negative terminal, but it is always best to test the polarity with a 9-volt battery before sealing the door back up.
Step-by-Step Installation Guide for Front Doors
The front doors are where you will spend the most time. Since the 1998 ford f150 speaker size is a standard 6×8, the fitment is usually “drop-in,” but the teardown requires patience. Follow these steps to ensure you don’t damage your window switches or door locks.
Step 1: Remove the Trim and Screws
Start by removing the plastic “sail panel” (the triangle piece near the mirror). It usually pops off with a gentle tug. Next, remove the screw holding the door handle shroud in place. Remove the shroud and set it aside.
Pop up the window switch assembly using your pry tool. Unplug the electrical connectors. Behind this switch plate, you will find one or two 7mm bolts that secure the door panel to the metal frame. Remove these bolts immediately.
Step 2: Lifting the Door Panel
Check the very bottom of the door for any additional screws. Once all fasteners are removed, grab the door handle area and lift the entire panel straight up. Do not pull it toward you yet. The panel hangs on plastic hooks.
Once the hooks are clear of the slots, you can pull the panel away. Be mindful of the courtesy light bulb at the bottom of the door. Twist the bulb socket to remove it from the panel so you can set the entire door card aside in a safe place.
Step 3: Swapping the Speakers
Unscrew the four Phillips screws holding the old speaker. Pull the speaker out and disconnect the harness. Connect your new 6×8 speaker using the wiring adapter. Before screwing it in, turn on your truck’s radio and test the sound.
While the speaker is playing, roll the window down slowly. Watch the back of the speaker to ensure the glass doesn’t make contact with the magnet. If it clears, tighten the screws and reassemble the door panel in the reverse order.
Choosing the Best Aftermarket Speakers
Knowing the 1998 ford f150 speaker size is only half the battle; you also need to choose the right type of speaker for your listening habits. Since the F-150 cabin is relatively noisy, especially if you have off-road tires, you need speakers that can cut through the road drone.
Coaxial Speakers: These are the most common. They feature the woofer and the tweeter in one unit. They are affordable and very easy to install. Look for models with silk dome tweeters if you want a smoother sound, or metal domes if you want the highs to be loud and crisp.
Component Systems: These separate the woofer and tweeter. They provide much better “imaging,” meaning the music feels like it’s coming from the dashboard rather than your ankles. These are harder to install because you have to mount the crossover box and find a spot for the tweeter.
If you are still using the factory head unit (the radio in the dash), look for speakers with high sensitivity (90dB or higher). High-sensitivity speakers require less power to play loudly, making them a great match for the low-output factory Ford radio.
Pro Tips for Better Sound Quality
If you want to get the most out of your new 1998 ford f150 speaker size upgrade, don’t just screw the speakers into the metal. A few extra steps can make a $50 set of speakers sound like a $200 set.
Sound Deadening: Apply a small square of butyl-based sound deadener (like Dynamat or Noico) to the outer metal door skin behind the speaker. This reduces vibrations and stops the door from sounding like a “tin can” when the bass hits. Foam Fast Rings: Use foam gaskets around the front of the speaker. This seals the speaker against the back of the door panel, forcing all the sound through the grille and into the cabin rather than letting it escape into the door cavity. Check for Moisture: 1998 F-150s are notorious for leaky window seals. If you see water stains on your old speakers, consider installing silicone speaker baffles. These act as an umbrella, protecting your new investment from rain dripping down inside the door.
Frequently Asked Questions About 1998 ford f150 speaker size
Can I fit 6.5-inch round speakers in my 1998 F-150?
Yes, but you will need an adapter bracket. Many 6.5-inch speakers come with these brackets in the box, or you can purchase them separately. 6.5-inch speakers often offer better mid-bass response and more variety in the aftermarket than 6x8s.
Do I need to replace the factory speaker wire?
For a standard speaker upgrade, the factory wiring is perfectly fine. The copper used by Ford in 1998 is of decent quality. You only need to run new wires if you are installing a high-powered external amplifier (over 75 watts RMS per channel).
What is the 1998 ford f150 speaker size for the Regular Cab rear pillars?
The rear pillar speakers in a Regular Cab are also 6×8 inches. Even though the space looks smaller from the outside, the mounting bracket behind the plastic trim is identical to the one found in the front doors.
My new speakers sound “thin” or have no bass. What’s wrong?
This is usually caused by out-of-phase wiring. If you swapped the positive and negative wires on one speaker but not the other, they will cancel each other out. Double-check your connections to ensure both sides are wired identically.
Will 6×9 speakers fit in the door?
Generally, no. A 6×9 speaker is slightly too large for the factory opening. You would need to cut the metal of the door frame to make them fit. Given how many great 6×8 options exist, it is usually not worth the effort to hack up your truck for 6x9s.
Final Thoughts on Your F-150 Audio Project
Upgrading your 1998 Ford F-150 audio system is one of the most effective ways to modernize your truck. By sticking to the correct 1998 ford f150 speaker size, you ensure a clean installation that looks factory-original but sounds lightyears better.
Take your time with the door panels, use the proper pry tools, and always test your speakers before you snap the trim back into place. Whether you’re cruising down a highway or bouncing along an off-road trail, having a high-quality soundtrack makes every mile more enjoyable. Stay safe, keep your wiring clean, and enjoy the new life you’ve breathed into your classic Ford!
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