Product Description
It Makes Work Go Better
A classic 1955-59 GMC truck is enough to make any workday better. These trucks are real workhorses.
To make the day go even better, pair your truck with the Custom Autosound USA-630. It'll have you whistling while you work.
A Little Music Goes a Long Way
Inside the USA-630, 300 watts of power are ready to deliver the best sound possible. Once that sweet sound hits your ears, work goes easier and more cheerfully.
A power antenna lead helps bring in your 25 presets (15 FM, 10 AM) and other stations on the RDS electronic tuner, and the 7-color display always shows the song and artist name.
Tired of whistling along to the radio? Play CDs through a changer, or your iPod, MP3 and WMA music.
Still not convinced? Add a 4-way fader, 4-channel RCA pre-outs, a 2-channel AUX input, a full set of tone controls and a built-in digital EQ.
Your Radio, Your Truck, Your Whistle
The USA-630 gives you the sound you want in your classic 1955-59 GMC truck, so you can whistle while you work all day.
The USA-630 is the latest step in Custom Autosound's quest for the perfect classic car radio. Its large OEM-style push buttons look right at home in a classic dash, but behind them are modern features like an iPod dock. You can browse your iPod by artist, song, album or playlist from the radio's buttons, so the iPod can stay hidden in the glove box or console. A USB input on the back plays MP3/WMA files from a flash drive, and the alphanumeric display shows song, artist and album titles from USB, iPod and RDS radio stations.
With the optional BluKit, you can stream music from a Bluetooth phone or player, skip tracks with the radio's track-up button, and take hands-free calls while the music mutes automatically. At 300 watts peak, it has all the power most people need. If you want more, four pre-out jacks on the back connect optional amplifiers, and an auxiliary input accepts satellite radio or any portable player.
The USA-630 Features:
• AM/FM stereo
• RDS tuner shows station / song / artist on LCD display
• 300 Watts Peak
• USB Port for Flash Drive MP3/WMA Playback
• iPod dock and control (control your iPod from the buttons on the radio)
• Direct 6 CD Changer Control
• 7-color LCD display with dimmer control
• Alpha Numeric Display for MP3/WMA/ iPod files
• Electronic Tuning and Volume Control
• Loudness compensation
• Digital EQ
• 4-way fader
• Left Right Balance
• Digital Clock
• 2 Channel RCA Auxiliary Input for Satellite etc. (cable included)
• 25 Presets (15 FM, 10 AM)
• 4 Channel RCA Pre-outs
• Separate Bass and Treble
• USA/Euro Tuner
• Power Antenna Lead
Questions About the 1955-59 GMC Truck USA-630 In Dash AM/FM
Do I need to modify the 1955-59 GMC Truck dash to install it?
This version is built for the 1955-59 GMC Truck and is made to fit the factory radio opening. Custom Autosound says its radios fit without altering or cutting the original dash.
What do I get with the USA-630 in my 1955-59 GMC Truck?
A USB port plays MP3 and WMA files from a flash drive, and the display shows artist and song titles. It can directly control Custom Autosound's optional CD-1 player.
What else should I know about the USA-630?
Custom Autosound rates it at 300 watts peak (45 watts RMS x 4), with four RCA pre-outs for adding amplifiers. Bluetooth streaming and hands-free calling come from Custom Autosound's optional BluKit, which works with the USA-630.
What can the USA-630 do?
The RDS tuner shows station, song and artist information, and you get 25 presets (15 FM, 10 AM). It also has digital EQ, separate bass and treble, loudness, a 4-way fader and a 2-channel RCA auxiliary input with cable included.
Why does the order ask about factory air?
Select Yes or No under Factory Air so we send the correct setup for your 1955-59 GMC Truck's dash.
Can I add a CD player or Bluetooth?
Check the CD options on this page, which include Single Slave CD and Bluetooth Adapter.
USA-630 specifications
- 300 watts peak power (45W x 4 RMS)
- AM/FM stereo tuner
- USB port for flash-drive playback (MP3/WMA/FLAC/WAV)
- Optional Bluetooth via BluKit add-on (sold separately)
- RCA auxiliary input (rear)
- Direct control for optional CD-1 changer
- 4-channel 5V RCA pre-outs
- Digital clock
- 7-color LCD display with dimmer
- Alphanumeric display for USB/iPod/RDS info
- Separate bass and treble; 4-way fader; L/R balance
- 25 presets (15 FM / 10 AM)
- Loudness compensation
- Power antenna lead
- USA/EURO/JAP/AUS/RUS tuner capability
- Custom Autosound 2-year manufacturer warranty
USA-630 wiring and tech tips
Use this as a head-unit reference for power, ground, antenna, speakers, and amplifier connections. Always match the printed diagram that ships with your unit if it differs.
Power and ground (typical Custom Autosound harness)
| Function | Wire color |
|---|---|
| Ignition / ACC +12V | Red |
| Battery / constant +12V | Yellow |
| Ground | Black |
| Power antenna | Blue |
Ignition and power-antenna leads are commonly fused at 1A on the harness—confirm against the guide that ships with your radio.
Speaker wiring (typical)
| Speaker | Wire color |
|---|---|
| Left front + / − | White / White-Black |
| Right front + / − | Gray / Gray-Black |
| Left rear + / − | Green / Green-Black |
| Right rear + / − | Violet (or Purple) / Violet-Black |
USA-630 extras
USB and iPod/dock leads share a cable near the antenna jack on many units. RCA jacks on top are typically labeled AUX IN, REAR, and FRONT (line out). Bluetooth requires the optional BluKit unless your package already includes it.
Suggested order for a 1955-1959 GMC Truck
- Disconnect the vehicle battery before any wiring.
- Connect ground first, then constant (yellow) and ignition (red).
- Connect the antenna plug and the blue power-antenna lead if your car has a power antenna.
- Wire all four speakers, matching polarity.
- If using an amplifier, run RCA cables from the front/rear (and sub on USA-740/USA-850) pre-outs.
- Reconnect the battery and test radio, speakers, and charging system voltage.
Tech tips for 1955-1959 GMC Truck
- This radio is sold for the factory GMC Truck opening used in 1955-1959 models—do not cut a modern DIN rectangle if you want a stock look.
- A poor ground is the most common cause of whine or weak audio; scrape paint at the ground point and use a star washer.
- If AM reception is weak, check the antenna mast, cable continuity, and that the antenna plug is fully seated.
- Vintage Car Radio does not install radios. If you are not comfortable with 12V wiring, use a qualified installer.
USA-630 manuals
Download the manufacturer guide for operation, safety, and the official wiring diagram. You can also browse our full library on the Manuals page.
Vintage Car Radio does not offer installation. The manuals are for do-it-yourself reference or to share with your installer.
Two-Year Custom Autosound Warranty
All Custom Autosound radios sold by Vintage Car Radio are backed by a 2-year manufacturer warranty from Custom Autosound.
Radios are checked before shipping. If something is wrong out of the box or under warranty, call us at 844-802-4499 or 574-226-6676 and we will help coordinate with the manufacturer.
Vintage Car Radio does not offer installation services. Refer to the Manuals and Wiring / Tech Tips sections for manufacturer guidance, or use a qualified car-audio installer.
FAQ — 1955-1959 GMC Truck USA-630
Will this fit my 1955-1959 GMC Truck without cutting the dash?
It is built for the original radio opening used on 1955-1959 GMC Truck models. Compare your dash opening and bezel to the product photos. We do not modify dashes in-house.
Does this radio have Bluetooth?
The USA-630 supports Bluetooth with the optional BluKit add-on (sold separately).
Do I need an amplifier?
Many owners run speakers directly from the radio. Pre-outs are there if you want more volume or a subwoofer later.
Do you install the radio?
No. Vintage Car Radio ships the unit and documentation; installation is DIY or by a shop you choose.
What is the warranty?
Custom Autosound radios include a 2-year manufacturer warranty. See the Warranty section for details.
Need help?
Call 844-802-4499 or 574-226-6676.
Specs
Wiring / Tech Tips
Manuals
Warranty
Two-Year Custom Autosound Warranty
All Custom Autosound radios sold by Vintage Car Radio are backed by a 2-year manufacturer warranty from Custom Autosound.
Radios are checked before shipping. If something is wrong out of the box or under warranty, call us at 844-802-4499 or 574-226-6676 and we will help coordinate with the manufacturer.
Vintage Car Radio does not offer installation services. Refer to the Manuals and Wiring / Tech Tips sections for manufacturer guidance, or use a qualified car-audio installer.
