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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,206 Posts1,057,433 Members48,471 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | The original AD era radios used mechanical vibrators which were not polarity specific. Today we can buy modern solid state replacements and they are polarity specific.
There were two model runs for the AD years. Either model can be used in the trucks from 1947 to 1953. The first model was used from 1947 to 1950 and the back cover met the case on a slanted seam along the two vertical sides. These are known as the "slant back" radios. The model produced from 1951 to 1953 had a straight back with similar dimensions to the other GM radio backs. The two radios look virtually identical when installed in the truck although the dials are slightly different. The chassis have different configurations and there are some differences in the circuits. | | |
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