Metra 40-GM21 Antenna Adapter
Crutchfield customer from Pks, NC on 12/15/2020
2001 Chevrolet Silverado 2500/3500
0 of 0 found this helpful
Antenna Adapter
Crutchfield customer from Peterborough, NH on 1/16/2020
2003 Chevrolet Avalanche
Item fit and worked perfectly. Pleased with my purchase.
Pros: Fit like a dream
Cons: None
0 of 0 found this helpful
Metra 40-GM21 Antenna Adapter
Crutchfield customer from Churchton, MD on 6/18/2019
0 of 0 found this helpful
Metra 40-GM21 Antenna Adapter
Crutchfield customer from Clarksdale, MS on 3/6/2019
2003 Chevrolet Silverado 1500
Exactly what I needed to make the connection from module to my vehicle stock radio for installation of an external audio input.
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0 of 0 found this helpful
Metra 40-GM21 Antenna Adapter
Crutchfield customer from Havre De Grace, MD on 7/10/2018
1998 Pontiac Grand Prix
Works great as all Crutchfield products do.
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0 of 0 found this helpful
Metra 40-GM21 Antenna Adapter
Jason from Walland, TN on 6/30/2018
1988 Dodge B Series
The product was great just wrong application wouldn't work for my radio
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0 of 0 found this helpful
Plug and play
Doug from Knightdale, NC on 7/7/2017
Plug and play it works
Pros: Easy install made rest of installation easier
Cons:
0 of 0 found this helpful
Metra 40-GM21 Antenna Adapter
Jeremy L. from Swansboro, NC on 2/21/2017
2006 Hummer H3
Exact fit. High quality and fast shipping. I have been buying from Crutchfield since I was a teenager and I will continue to buy from them.
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0 of 0 found this helpful
Metra 40-GM21 Antenna Adapter
Richard from Tavernier, FL on 9/25/2016
2003 Chevrolet Blazer
Did not fit..... I ORDERED THE WRONG PART. They refunded the part immediately, no questions asked
Pros: Great customer support and prompt service
Cons: None
0 of 0 found this helpful
Metra 40-GM21 Antenna Adapter
jg from North Carolina on 9/7/2015
cheaply made had to electrical tape together
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1 of 1 found this helpful
Backwards
Crutchfield customer from Indiana on 1/20/2015
1998 Saturn SC1
Did not fit. The connections were backwards.
Pros:
Cons: Did not fit, connections were the opposite of what my GM car required.
1 of 1 found this helpful
perfect fit
jroman from rockford,il on 9/7/2014
perfect fit adds satelite to factory radio using xm module
Pros: keeps factory radio adds satelite with module
Cons: none
2 of 2 found this helpful
worked like a charm
joe from fredericksburg on 2/22/2014
2000 GMC Yukon XL
my only gripe with gm vehicles is their ant. cables.does anybody know the reason for using small cables?
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1 of 1 found this helpful
Simple and easy
AlcoholicProgram from Pittsburgh, PA on 9/1/2013
1997 Cadillac DeVille
Possibly the easiest thing to install so far. The GM Antenna adapter by Metra could not be any better. It does exactly as intended. If the low price scared you, or might even have you jump right into purchasing it, think again. The GM Adapter by Metra is the best product for its use and makes installing a new system that much easier and better.
Pros: Works perfect, simple install, very inexpensive.
Cons: Absolutely none.
1 of 2 found this helpful
Metra 40-GM21 Antenna Adapter
Timi from San Mateo, CA on 8/17/2013
1998 Oldsmobile Cutlass
Good product but couldn't use it because I did not specify which one I needed.
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0 of 0 found this helpful
Just the ticket too
This fits the radio and lets a regular antenna work on GM products.
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1 of 1 found this helpful
Too long
Ken from Saint Paul, MN on 5/19/2013
2001 Chevrolet Tahoe
Worked like a charm
Pros: Plugged in tight.
Cons: Too long. Had issues with stuffing it an all the other wires back. behind stereo.
0 of 0 found this helpful
Great Adapter
C P from Tuscaloosa, Al on 5/6/2013
Great adapter, had no problems installing in my 2002 Chevy S-10.
Pros: Great adapter, easy installation
Cons: None
1 of 2 found this helpful
Metra 40-GM21 Antenna Adapter
John W. from Cuba, NY on 3/26/2013
0 of 0 found this helpful
Worked great
TSub from Central KY on 1/29/2013
This worked great for taking my Suburban back to a stock radio. The adapter made it easy to put a factory style radio back in since the antennas are somehow different. Had no issues with loose connections either.
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1 of 1 found this helpful
Don't Know Yet
Billy M from Sumrall, Mississippi on 1/2/2013
2006 Pontiac Grand Prix
Had to use this with an adaptor for FM modulator of iPod. Did not fit very tight on a GM radio. Still works, but it seems like if ever hit a large bump in the road it's probably going to come out. But I may be wrong.
Pros: Works, so far.
Cons: Fits loosely in GM radio.
0 of 0 found this helpful
Metra 40-GM21 Antenna Adapter
Michael from Flagstaff AZ on 2/21/2009
2004 Chevrolet Malibu (Classic)
Why does GM use a weird miniturized Motorola antenna connector? Dunno, but they do. This is the answer (or if you are installing an XM modulator in-line, it is half the answer.)
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7 of 9 found this helpful
