In 1964 and 1965 Flxible produced a suburban model meant for longer distance highway routes, and these buses were equipped with all forward-facing high-backed seats and overhead luggage racks, but lacked a rear exit door and standee windows.

In 1963, Flxible started building a line of shorter buses at the former Southern Coach factory in Evergreen, Alabama.

During the 1960s, Flxible was the only large-production competitor to General Motors in the American transit bus market, although it was still a distant second with GM building more than twice as many buses.

This was due largely to the consent decree resulting from the 1956 anti-trust case United States v. General Motors Corp. which mandated that GM's bus components, engines, and transmissions be made available for sale to other manufacturers, free of royalties.

[5] Another area of competition between the two manufacturers, but where Flxible had an advantage, was the market for 35-foot (10.7 m) long buses equipped with 8-cylinder diesel engines.

In response to the desire by some transit agencies for a shorter bus with a larger engine (mainly for hilly routes, freeway driving, or to provide extra power for air conditioning equipped buses), Flxible offered its 35-foot (10.7 m) New Look with the Detroit Diesel 8V-71, the Cummins 165-285, and the Cummins 903 8-cylinder diesel engines.