Although the Monaro name had survived into 1977 as the HX Monaro GTS sedan, the coupe configuration was no longer in production and Holden decided to delete the Monaro name altogether from the new Holden HZ range.
With the development of Radial Tuned Suspension, Holden transformed the bland characteristics of their full-size sedans and introduced a sporting variant called simply Holden GTS.
Released on 5 October 1977, the HZ GTS featured a four headlight grille, front and rear air dams, four-wheel disc brakes, sports wheels and a 4.2-litre V8 engine as standard equipment. The optional 5.0-litre V8 became standard in June 1978. But, with the November 1978 introduction of the new mid/full-size VB Commodore sedan and its availability with V8 engine power, the days of the HZ series appeared numbered. Production of the GTS ceased in December 1978, an estimated 1,438 having been built.
Ultimately, the VB Commodore proved very popular in both six-cylinder and V8 form, such that all full-size HZ Holdens passenger cars were phased out of production in 1980. Remnants of the H-series lived on in the Holden WB series commercial vehicle range and in the revamped Statesman WB sedans until 1985.