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Based on the Phantom V, the Phantom VI had a re-styled facia and was powered by an engine derived from the current Rolls-Royce Silver Shadow. Most of the coachwork was created by Mulliner Park Ward, usually in limousines form, though a few landaulettes were made.
The Phantom VI was the last Rolls-Royce with separate chassis. It featured coil springs in front, leaf springs in rear, and drum brakes on all four wheels. The car was powered by a twin SU carburettors 6,230 cc (380 cu in) 90 degree V8 with a bore of 104 mm (4.1 in) and stroke of 91.5 mm (3.60 in), coupled to a 4-speed automatic gearbox. In a 1979 upgrade, engine capacity was increased to 6,750 cc (412 cu in), a 3-speed automatic gearbox with torque converter was substituted, and separate front and rear air conditioning units were provided. Inclusion of the engine from the Rolls-Royce Silver Spirit in 1982 increased engine displacement once more, to 6,750 cc.
A total of 374 Phantom VIs were made. Design of a Phantom VII based on the Silver Shadow's body was discussed in the 1970s, but plans were scrapped.
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On September 2010 a Phantom VI which belonged to Mohammad Reza Pahlavi the late Shah of Iran was put on display in Niavaran Palace Complex in Tehran.
A Rolls-Royce Phantom VI dating to 1970 is the State Car of the Governor-General of the Commonwealth of Australia. It is typically used only on rare occasions, such as the State Opening of Parliament or the swearing-in of a new Governor-General.
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