For 1977, the Eldorado received a new grille with a finer crosshatch pattern. The convertible was canceled (although Custom Coach of Lima, Ohio took a few brand-new 1977 and 1978 Eldorados into their coachbuilder facilities and converted them into coach convertibles using salvaged parts from 1971-76 Eldorados; Cadillac did not produce convertibles after 1976). The 8.2L V8 of 1970-76 gave way to a new 7L V8 with 180 bhp (134 kW). Also in 1977, all E-body cars were exclusively front-wheel drive for the first time, when Buick removed the Riviera from that platform during a two-year hiatus (after which it also switched to front-wheel drive in 1979). Minor changes followed in 1978.
Source: Wikipedia, 2012