The first major change to the design of Crown fire apparatus was enlarged and modernized cab.  The idea was conceived in 1974 by Crown employees Ed McClave and Grant Everett and Chief Engineer Frank Bertholet was responsible designing and engineering the "Wide Cab".  When completed and fitted to a Firecoach body in 1977, the wide cab was not only larger but featured better ergonomics.  One of the upgrades included improved 10 inch front brakes on the apparatus. 
The prototype wide cab pumper carries serial number F1778 and was sold to the Rubidoux, CA Fire Department in 1977 where it served as Engine 1.  F1778 was powered by a Cummins NTF-295 diesel engine and Allison Automatic transmission with a 1,250gpm Waterous pump and 500 gallon tank.  Later, when Rubidoux Fire Department was absorbed into the Riverside County Fire Department, F1778 served as Engine 38.  Recently, F1778 was adopted by the Riverside Chapter of CDF Firefighters as a parade engine and is in the process of being restored to its appearance when delivered.