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Metra
Metra 40-GM20 General Motors Reverse Antenna Adapter 1988-2008
Metra 40-GM20 General Motors Reverse Antenna Adapter 1988-2008
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$14.99 USD
Regular price
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$14.99 USD
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The Metra 40-GM20 Antenna Adapter is designed for select General Motors vehicles. It provides the antenna connection needed when using an aftermarket antenna with the original factory radio.
At a Glance
- Vehicle-specific antenna adapter for select General Motors vehicles
- Supports using an aftermarket antenna with the original factory radio
- Female Motorola connector to male GM mini antenna connector
- Helps maintain the AM/FM antenna connection during radio, antenna, navigation, or FM-modulator integration
- Designed to avoid cutting factory antenna wiring when matched to the correct vehicle and radio configuration
System / Fitment Notes
- Reverse antenna adapter for retaining the factory radio while adapting an aftermarket antenna connection
Exact Vehicle Compatibility
Find your vehicle below, then match the model year and factory-equipment details in the same row. Factory radio, amplifier, navigation, trim, speaker location, and connector differences can change which installation parts are required. If anything differs, contact MCOR before ordering.
| Make | Model | Years | Factory Equipment / Qualifier |
|---|---|---|---|
| Buick | Century | 1988-1989 | — |
| Buick | Electra | 1988-1989 | — |
| Buick | LaCrosse | 2005-2009 | aka Allure in Canada |
| Buick | LeSabre | 1988-1989 | — |
| Buick | LeSabre | 1990 | — |
| Buick | LeSabre | 1991-1994 | — |
| Buick | Park Avenue | 1988-1990 | — |
| Buick | Park Avenue | 1991-1994 | — |
| Buick | Rainier | 2004-2007 | — |
| Buick | Reatta | 1988-1989 | — |
| Buick | Reatta | 1990-1991 | — |
| Buick | Regal | 1988-1994 | — |
| Buick | Rendezvous | 2002-2007 | — |
| Buick | Riviera | 1986-1989 | — |
| Buick | Riviera | 1990-1995 | — |
| Buick | Roadmaster | 1991-1994 | — |
| Buick | Skyhawk | 1988-1989 | — |
| Buick | Skylark | 1987-1995 | — |
| Buick | Terraza | 2005-2007 | — |
| Cadillac | Brougham | 1987-1989 | — |
| Cadillac | Brougham | 1990-1992 | — |
| Cadillac | Coupe DeVille | 1988-1989 | — |
| Cadillac | Coupe DeVille | 1990-1993 | — |
| Cadillac | DeVille | 1988-1989 | — |
| Cadillac | DeVille | 1990-1993 | — |
| Cadillac | DeVille | 1994-1995 | — |
| Cadillac | DeVille Concours | 1994-1995 | — |
| Cadillac | Eldorado | 1988-1991 | — |
| Cadillac | Eldorado | 1992-1993 | column shift |
| Cadillac | Eldorado | 1992-1993 | console shift |
| Cadillac | Eldorado | 1994-1995 | — |
| Cadillac | Escalade, Escalade ESV, Escalade EXT | 2003-2006 | — |
| Cadillac | Fleetwood | 1988-1989 | — |
| Cadillac | Fleetwood | 1990-1992 | less Brougham |
| Cadillac | Fleetwood | 1993-1995 | — |
| Cadillac | Fleetwood | 1996 | — |
| Cadillac | Fleetwood Brougham | 1990-1992 | — |
| Cadillac | Seville | 1988-1991 | — |
| Cadillac | STS | 2005-2011 | — |
| Cadillac | XLR | 2004-2009 | — |
| Chevrolet | Astro Van | 1985-1990 | — |
| Chevrolet | Avalanche | 2002 | — |
| Chevrolet | Avalanche | 2003-2006 | — |
| Chevrolet | Beretta | 1988-1990 | With a/c |
| Chevrolet | Beretta | 1988-1990 | Without a/c |
| Chevrolet | Blazer | 1992-1994 | full size |
| Chevrolet | C/K Pickup | 1988-1994 | — |
| Chevrolet | Camaro | 1990-1992 | — |
| Chevrolet | Caprice | 1991-1993 | — |
| Chevrolet | Cavalier | 1988-1990 | — |
| Chevrolet | Celebrity | 1990 | — |
| Chevrolet | Cobalt | 2005-2006 | With OnStar |
| Chevrolet | Cobalt | 2005-2006 | Without OnStar |
| Chevrolet | Colorado | 2004-2012 | — |
| Chevrolet | Corsica | 1988-1990 | With a/c |
| Chevrolet | Corsica | 1988-1990 | Without a/c |
| Chevrolet | Corvette | 1984-1989 | — |
| Chevrolet | Corvette | 1997-1998 | — |
| Chevrolet | Corvette | 1999-2004 | — |
| Chevrolet | Corvette | 2005-2013 | — |
| Chevrolet | Equinox | 2005-2006 | — |
| Chevrolet | Express | 2001-2002 | — |
| Chevrolet | Express | 2003-2007 | — |
| Chevrolet | Kodiak C4500-8500 | 2003-2009 | — |
| Chevrolet | Lumina APV | 1990-1992 | — |
| Chevrolet | Malibu | 2004-2007 | — |
| Chevrolet | Malibu Classic | 2008 | — |
| Chevrolet | Malibu Maxx | 2004-2007 | — |
| Chevrolet | S-10 Blazer | 1988-1989 | — |
| Chevrolet | S-10 Blazer | 1990-1994 | — |
| Chevrolet | S-10 Pickup | 1989-1993 | — |
| Chevrolet | Silverado | 2003-2006 | — |
| Chevrolet | Silverado Classic | 2007 | — |
| Chevrolet | Suburban | 1988-1991 | — |
| Chevrolet | Suburban | 1992-1994 | — |
| Chevrolet | Tracker | 1998-2004 | — |
| Chevrolet | Trailblazer | 2002-2009 | — |
| Chevrolet | Uplander | 2005-2008 | — |
| GMC | C/K Pickup | 1988-1994 | — |
| GMC | Canyon | 2004-2012 | — |
| GMC | Jimmy | 1988-1991 | full size |
| GMC | S-15 Sonoma | 1986-1992 | — |
| GMC | S-15 Sonoma | 1993 | — |
| GMC | Safari | 1985-1990 | — |
| GMC | Safari | 1991-1995 | — |
| GMC | Suburban | 1988-1991 | — |
| GMC | Suburban | 1992-1994 | — |
| GMC | Topkick C4500-8500 | 2003-2009 | — |
| GMC | Yukon | 1992-1994 | — |
| GMC | Yukon Denali, Yukon XL Denali | 2003-2006 | — |
| GMC | Yukon, Yukon XL | 2003-2006 | — |
| Hummer | H2 | 2003 | — |
| Hummer | H2 | 2004-2007 | — |
| Hummer | H3 | 2006-2010 | — |
| Hyundai | Santa Fe | 2003-2006 | With Monsoon amp |
| Isuzu | Ascender | 2003-2008 | — |
| Isuzu | Hombre | 1998-2001 | — |
| Isuzu | I-280, I-350 | 2006 | — |
| Isuzu | I-290, I-370 | 2007-2008 | — |
| Kia | Sorento | 2003-2006 | EX |
| Kia | Sorento | 2003-2006 | LX With Sport Package |
| Oldsmobile | Achieva | 1992 | — |
| Oldsmobile | Alero | 2001-2004 | — |
| Oldsmobile | Bravada | 1991-1994 | — |
| Oldsmobile | Cutlass Calais | 1988-1989 | — |
| Oldsmobile | Cutlass Calais | 1990-1991 | — |
| Oldsmobile | Cutlass Ciera | 1988-1989 | — |
| Oldsmobile | Cutlass Ciera | 1990-1994 | — |
| Oldsmobile | Cutlass Supreme | 1988-1989 | — |
| Oldsmobile | Cutlass Supreme | 1990-1991 | — |
| Oldsmobile | Cutlass Supreme | 1992-1994 | — |
| Oldsmobile | Eighty-Eight | 1988 | — |
| Oldsmobile | Eighty-Eight | 1989-1991 | — |
| Oldsmobile | Eighty-Eight | 1992-1993 | — |
| Oldsmobile | Intrigue | 1998-2001 | — |
| Oldsmobile | Intrigue | 2002 | — |
| Oldsmobile | Ninety-Eight | 1988 | — |
| Oldsmobile | Ninety-Eight | 1989-1993 | — |
| Oldsmobile | Regency | 1997-1998 | — |
| Oldsmobile | Silhouette APV | 1990-1992 | — |
| Oldsmobile | Toronado | 1983-1987 | — |
| Oldsmobile | Toronado | 1988-1993 | — |
| Oldsmobile | Touring Sedan | 1988-1990 | — |
| Pontiac | 6000 | 1986-1987 | — |
| Pontiac | 6000 | 1988-1989 | — |
| Pontiac | 6000 | 1990-1991 | — |
| Pontiac | Aztec | 2001-2005 | — |
| Pontiac | Bonneville | 1992-1993 | — |
| Pontiac | Bonneville Safari Wagon | 1987-1989 | — |
| Pontiac | Firebird, Firebird Trans Am | 1988-1989 | — |
| Pontiac | Firebird, Firebird Trans Am | 1990-1992 | — |
| Pontiac | G6 | 2005-2008 | — |
| Pontiac | G6 | 2009 | 5th Digit VIN G, H or M |
| Pontiac | Grand Am | 1988-1989 | — |
| Pontiac | Grand Am | 1990-1991 | — |
| Pontiac | Grand Am | 1992-1995 | — |
| Pontiac | Grand Prix | 1988-1989 | — |
| Pontiac | Grand Prix | 1990-1991 | — |
| Pontiac | Grand Prix | 1992-1993 | — |
| Pontiac | Grand Prix | 2004-2008 | — |
| Pontiac | Lemans | 1988-1993 | — |
| Pontiac | Montana SV6 | 2005 | — |
| Pontiac | Montana SV6 | 2006-2007 | Canada only |
| Pontiac | Sunbird | 1988 | — |
| Pontiac | Sunbird | 1989-1994 | — |
| Pontiac | Torrent | 2006 | — |
| Pontiac | TransSport APV | 1990-1992 | — |
| Pontiac | Vibe | 2003-2008 | — |
| Saab | 9-7x | 2005-2009 | — |
| Saturn | Relay | 2005-2007 | — |
| Saturn | S Series | 1991-1994 | — |
| Toyota | Matrix | 2003-2004 | — |
| Toyota | Matrix | 2005-2008 | — |
Fitment note: Year and model alone are not always enough to confirm compatibility. Match every factory-equipment qualifier shown for your vehicle, and contact MCOR Automotive if the radio, amplifier, navigation, speaker, camera, trim, or connector details are uncertain.
Installation Notes
- Confirm exact year, make, model, factory radio, antenna connector style, and radio being installed before installation
- Test-fit the antenna adapter and review manufacturer instructions before final assembly
- Additional dash kits, wiring harnesses, steering wheel control interfaces, or factory feature-retention parts may be required
- Professional installation is recommended for best results
What’s in the Box
- Antenna adapter cable
Technical Specifications
- Brand: Metra
- Model: 40-GM20
- Product Type: Antenna adapter
- Application: Vehicle antenna integration
- Connector Type: Female Motorola connector to male GM mini antenna connector
Identifiers & Packaging
- MPN: 40-GM20
- UPC: 086429007042
- Sold As: Each
- Included Components: Antenna adapter cable
Why Buy From MCOR Automotive
- Authorized retailer for the brands we sell
- Specialists in vehicle audio integration, radio replacement parts, and installation accessories
- 22+ years of professional automotive electronics experience
- Expert support for compatibility verification and proper setup
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