 The fenders were replaced with fiberglass replicas to accommodate the wider wheels, reduced in diameter from , and numerous detail improvements were made, including replacing the original plywood floors with aluminum, upgrading exterior lights, and fitting safety glass windows.In late 2018, another renovation was announced for the Red Jammer fleet.The engines installed in the earlier renovation will be replaced by hybrid-assisted 6.2L V8 engines, replacing the 5.4L V8s fitted in 2000–02, and cosmetic details, including new wheels in diameter and gauges, will more closely resemble the original equipment as delivered in the late 1930s.