I know some GM models came standard with an AM radio until at least 1990, while I think all Chrysler radios were AM/FM beginning in 1988, perhaps even earlier.
Ford was the last holdout I can find of AM-only radios, in the 1996 (1996!) F-series pickup trucks. The Special and XL trim levels list "electronic AM radio with digital clock" as a standard feature:
The redesigned 1997 model finally made an AM/FM radio standard.
As of 1989, Ford still touted the fact that the F-150 came with an AM radio as standard as an advantage over the Chevrolet pickups:
I believe this is Ford's last AM-only radio:
Ford was the last holdout I can find of AM-only radios, in the 1996 (1996!) F-series pickup trucks. The Special and XL trim levels list "electronic AM radio with digital clock" as a standard feature:
The redesigned 1997 model finally made an AM/FM radio standard.
As of 1989, Ford still touted the fact that the F-150 came with an AM radio as standard as an advantage over the Chevrolet pickups:
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I believe this is Ford's last AM-only radio: