Product Description
Custom Autosound 1970-74 Challenger USA-740 In Dash AM/FM
The Custom Autosound USA-740 is built for enthusiasts who want Bluetooth streaming and hands-free calling inside a 1970-74 Challenger without hanging a modern double-DIN chassis in the dash. This year-banded listing covers the 1970-74 Dodge Challenger application so shoppers searching for a Challenger radio with Bluetooth land on a page that matches how Custom Autosound and classic-car buyers describe the upgrade. Vintage Car Radio stocks the USA-740 as a stand-alone radio so you can pair it with speakers you already own or add matched speakers later.
Fitment note: Mopar dashes vary. Confirm your Challenger falls in the 1970-74 range and that the radio opening matches the Custom Autosound application for this model. If your dash opening differs, call 844-802-4499 before ordering—some A-body and E-body cars are better served by a Secretaudio hideaway system. We sell the product only; we do not offer installation services.
Bluetooth and modern inputs
Built-in Bluetooth lets you stream playlists and take calls from a paired phone while the dash still looks like a classic Challenger. USB playback supports common digital audio files from a flash drive, and auxiliary inputs (front mini-jack and rear RCA) cover older players and other sources. The AM/FM RDS tuner with presets keeps local stations easy to reach on road trips and cruise nights.
Power and expansion
Four-channel amplification is sized for a classic-car stereo stage, and multi-channel RCA pre-outs with subwoofer control leave a path to add an external amplifier later. Separate bass and treble, EQ presets, fader, and balance give you control without a tablet glued to the windshield. An optional single-disc CD player can be added from the product options if you still spin discs.
Bluetooth in a classic Challenger
Stream music and take calls in a 1970–1974 Challenger without cutting the dash for a modern DIN radio. The USA-740 keeps a period-correct face while built-in Bluetooth handles the phone you already carry on every cruise.
E-body shoppers, clear landing page
Challenger searches deserve their own year-banded Bluetooth radio URL—the same approach used for Charger and Road Runner USA-740 pages—so enthusiasts are not stuck on a generic Mopar catch-all.
Custom Autosound USA-740 features:
- AM/FM radio with Bluetooth, USB, and auxiliary inputs
- Option to add CD-1 single CD player
- Bluetooth built into the radio
- Designed for the original dash opening (confirm fitment)
- 3.5mm aux on front; RCA aux on rear
- Selectable display lettering color
- Digital tuner with RDS song/artist information
- Multi-channel RCA pre-outs with subwoofer control
- Separate bass and treble; EQ presets; fader and balance
- 15 FM and 10 AM presets; seek/scan
- Backed by a 2-year manufacturer warranty from Custom Autosound
Frequently Asked Questions About the 1970-74 Challenger USA-740
Is this radio made for the 1970-74 Challenger?
This listing is the year-banded Custom Autosound USA-740 application for the 1970-74 Dodge Challenger. Confirm your dash opening matches; call 844-802-4499 if you need a dimensions check.
Do you install the radio?
No. Vintage Car Radio sells the product only and does not offer installation services. We can help you choose the right radio and accessories over the phone.
What warranty applies?
Custom Autosound radios are backed by a 2-year manufacturer warranty. Keep your order details for support questions.
Why ask about factory air, voltage, and ground?
Those options help us send the correct setup for your Challenger. Select the answers that match the car sitting in your garage.
Does the USA-740 include Bluetooth?
Yes. Bluetooth is built into the USA-740 for streaming and hands-free calling. An optional single CD player can be added from the product options.
Owners of 1970-74 Dodge Challenger cars who are comparing Custom Autosound USA-230, USA-630, and USA-740 feature sets can use this page as the USA-740 anchor for that year band. Keep browsing related Mopar radios on the site, then call 844-802-4499 if you want a second opinion on whether an in-dash USA radio or a Secretaudio hideaway unit fits your restoration goals better. Ordering the correct year-banded SKU up front avoids returns and keeps the project moving when the rest of the interior is already underway.
From a shopping perspective, year-banded Challenger radio pages also support later stereo packages that group a radio with speakers under one parent SKU. This stand-alone USA-740 listing stays live whether you buy only the radio today or come back for a package once speaker choices are settled. Either path uses the same Custom Autosound hardware Vintage Car Radio already stocks and supports.
USA-740 specifications
- Bluetooth built in (streaming and hands-free calling)
- 300 watts peak power (45W x 4 RMS, 2-ohm stable)
- AM/FM stereo tuner
- 2 AUX inputs (3.5 mm front and RCA rear)
- USB port
- Direct control for optional CD-1
- 5-channel RCA pre-outs including subwoofer pre-out and control
- 15 FM and 10 AM presets
- 7-color LCD with dimmer; RDS station/song/artist display
- DSP EQ; auto-store presets
- Electronic tuning and volume; separate bass/treble; 4-way fader; L/R balance
- Power antenna lead; digital clock
- USA/EUR/JAP/RUS tuner capability (USA default)
- Custom Autosound 2-year manufacturer warranty
USA-740 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-740 extras
Expect antenna, USB, microphone (Bluetooth), CD-1, and subwoofer RCA connections in addition to front/rear line outs. Use the front 3.5 mm AUX or rear RCA AUX for wired sources.
Suggested order for a 1970-74 Challenger
- 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 1970-74 Challenger
- This radio is sold for the factory Challenger opening used in 1970-74 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-740 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 — 1970-74 Challenger USA-740
Will this fit my 1970-74 Challenger without cutting the dash?
It is built for the original radio opening used on 1970-74 Challenger models. Compare your dash opening and bezel to the product photos. We do not modify dashes in-house.
Does this radio have Bluetooth?
Yes—Bluetooth is built into the USA-740 for streaming and hands-free calling.
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.
