How to Install a Modern Sound System on a 1967 Chevrolet Chevelle SS

Modern Sounds For Classic Chevys

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You’ve seen how our AMD ’67 Chevelle has transformed from a worn-out eyesore into an eye-catching and tire-melting SS396 once again. Now it’s time to upgrade one area on this A-body that’s seen big technological changes since the days when Chevrolet cranked out Chevelles by the minute: the sound system inside the cabin.

Back in ’67, Chevelle buyers didn’t have many factory-installed options for their on-board listening pleasure. There was the RPO U63 push-button AM radio or the RPO U69 AM/FM mono radio, both with a single dash-mounted speaker, plus the RPO U80 auxiliary (rear shelf) speaker and RPO U57 tape player (8-track) that were available with either radio…or you could choose radio delete, for nonstop road noise and engine sounds.

Custom Audiosound Usa 630 Ii Head Unit 2/37

Here’s a look at our AMD Chevelle’s new sound system before it went in. Custom Autosound’s USA 630 II head unit is flanked by its 6x9 rear speakers and kick panel–mounted front speakers.

Custom Autosound System 1 Subwoofer 3/37

Its System 1–powered subwoofer (above, right) is seen with its two tweeters, which we’ll use as tweeters and mount under the dash.

Aftermarket choices were equally as limited back then, too. The era of in-dash radio/tape player combos and cassette tape drives had yet to arrive, so your choices involved underdash-mounted 8-track players, plus speakers whose technology—and construction—wasn’t too far removed from that of the kazoo.

Visually, our AMD Chevelle went from something dragged out of a field to a concours-appearing muscle car, but one thing it lacked was a radio. As sweet as our rebuilt Rat sounded, it is hard to rock on down the highway without any rock ’n’ roll. We wanted a modern sound system that would easily install in our SS396. Custom Autosound came through with its USA 630 II head unit (AM/FM stereo tuner, a “System 1” subwoofer and tweeters, a pair of kick panel–mounted speakers for the front, and a pair of 6x9 speakers for the rear shelf.

Installing it all was straightforward, though there is metal cutting needed to install the 6x9s in the rear shelf, just as there was back in the day when the first aftermarket stereo installers got to work.

We now have a sound system that’s up to the task of keeping our SS396’s driver and passengers supplied with tuneage they can not only hear over the 396, but feel—thanks to the powered subwoofer. But it doesn’t give off that thudbuzzthudthudbuzzbuzzthudbuzz that too many rides with subwoofer-equipped sound systems give off.

Take a look at what went in to our SS396’s dash, kick panels, trunk, and rear shelf, courtesy of Custom Auto- sound. (Installation was done by Darrell Kunda, shop manager of our Tampa Tech Center.)

Custom Autosound In Dash Player 4/37

1. Looks factory stock, doesn’t it? That’s the idea—until you turn on the power. Then, what looks like a stock AM radio dial is replaced by a modern LCD display.

Remove Radio Bezel 5/37

2. First things first: With the stock radio relegated to history, installing the new one begins by removing the big chrome radio bezel from the dash.

New Head Unit Fit 6/37

3. Trial-fit the new head unit before attaching any mounting screws. It should be a snug fit, to prevent rattles and squeaks from showing up later on.

Shims Spacers Head Unit 7/37

4. Next, install shims/spacers on the head unit’s control shafts and install the provided lock washers on the control shafts. That secures the head unit to the dash. Then install the knobs on the shafts.

Head Unit Installed 8/37

5. The head unit is installed, so we’ll leave the power/speaker/antenna wiring below the dash for now and await the speakers/subwoofer installation.

Remove Step Plates 9/37

6. Time to add the front kick panel speakers. Start by removing the step plates from each front doorway. That not only makes it easier to remove the carpets (for your later rear-speaker installation), but also exposes this pressed-in “channel” atop the rocker panel on each side, where we’ll route the rear speaker and subwoofer wiring later.

Remove Vent Covers 10/37

7. Remove the vent covers on the right kick panel—you’ll reuse the right-side one. Once that’s done, remove the OEM/existing kick panels.

Custom Autosound Kick Panel 11/37

8. Install the new Custom Autosound right-side kick panel, which has the front speaker already in place. (Don’t forget to reinstall the vent door on the right-side panel!) The fit here will also be a tight one, which will prevent any later squeaks and rattles.

Kick Panel Speaker 12/37

9. Plug the kick panel speaker into the head unit’s right-front speaker input, per Custom Autosound’s directions. Repeat the installation on the left side, though you’ll likely have to remove the parking brake pedal assembly and move it aside so you can get at the left kick panel.

Tweeters Install 13/37

10. The tweeters are interesting because they resemble ’60s-era A/C vents. Start their installation by drilling two holes for the 1⁄8-inch self-tapping screws that will hold its mounting bracket in place. (We started with the right side here.)

Tweeter Mounting Bracket 14/37
Tweeter Install Wire 15/37

11. Next, screw the tweeter into the mounting bracket, then tap the tweeter wire into the kick panel speaker wire. Once the right side’s done, repeat these steps (drill, mount, tap) to install the left-side tweeter.

Trunk Subwoofer Install 16/37

12. We first wanted to install our subwoofer under the rear seat, but locating it in the trunk made more sense—especially when it comes to dissipating the heat it’s bound to generate once it’s cranking out the bass. Drill holes in the trunk floor for the 3⁄8-inch spacers at each corner and install the subwoofer.

Install Rear Speakers Rear Shelf 17/37

13. Installing the rear speakers will be the toughest part of this job because of the cutting required. (Dual rear-speaker openings weren’t stamped into GM A-body rear shelves until 1973.) Also, you can see why it’s a good idea to remove the whole back seat—not just to access the rear shelf, but also to run the air hoses/power cords for the cutting tools you’ll need to use.

Rear Speaker Location 18/37

14. For the rear speaker installation, start by trial-locating the speaker grilles on the rear shelf and marking their centerlines and screw-hole locations on the shelf.

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