In 1991, the Saf-T-Liner transit-style buses saw their first redesign since 1978. The ER and WestCoastER were given a much larger windshield, redesigned drivers' compartment, and saw the introduction of several new diesel engines. To better compete with the Blue Bird TC/2000 and Ward Senator (which became the AmTran Genesis), Thomas replaced the Saf-T-Liner EF with the All Star, using an Oshkosh-produced chassis. The Thomas Vista continued production, shifting chassis in 1991 from General Motors to a variant of Navistar chassis shared with the Saf-T-Liner Conventional.