About The 1990 Mustang
The recession of the late ’80s and early ’90s really affected the sale of vehicles, and the ever popular Mustang saw its share of poor sales. This resulted in a lower production rate and the 1990 Mustang remained basically the same as it had since 1987. Despite plummeting sales, the Mustang retained its cult like following and while the early ’90s would not prove to be the best selling years for the Mustang it did prepare the market for the new Mustang that appeared in 1994.
Source: Mustang Forums