For many years, the lines of big Jaguar sedans has remained practically unchanged, from MK VII to MK VIII and the following MK IX, there only have been a few aesthetic changes, so it was necessary to make a turn with a completely new model. After the success achieved in Geneva in March, with the presentation of the E-Type, Jaguar launches the MK X at the London Motor Show in October. The model resumed numbering compared to the previous ones, but it was evident that it was a completely different car, with load-bearing body, independent wheel suspension, disc brakes on all four wheels with rear differential at the output of the differential, for improving weight distribution.
The gear was available both manual (Moss) or automatic. For some, the line was not modern enough, the roof reminded that of the MK II but lower and the narrow track was also a cause of criticism, but with its large dimensions (5.10 m) it seemed slender, also thanks to the limited height of the “pavilion”. The aggressive front with the big flat grille sloping forward gave the huge bonnet the front line of the front mudguards that followed the proportions dictated by the double front headlights, the roof joining the rear, going uniform with a tail finishing subtly. Inside, a large triumph of walnut woods on dashboards and panels, large folding tables and high-quality leather trim with very comfortable seats, embellished with exquisite match-outs from the outside.
Mechanically we had the highly tested 3,781cc 6-cylinder powered by 3 SU carburettors. The nearly 200hp allowed to reach, despite the weight, about 195 kph. In 1964, to make the car more elastic, a 4,200cc engine was adopted – the gearbox was also replaced by a fully synchronized type, as in the case of the E-Type, with the addition of the overdrive. The automatic was a Borg Warner Mod.8, which is of crucial importance for the fundamental American market. Another update was the adoption of the Marlies “Varamatic” Bendix power steering, which made the car easy to maneuver.
In 1966 was the turn of a slight restyling, new chromed profile on the sides that in the case of bicolor painting also acted as division line and new front grille – also the name was updated, becoming the 420 G, with the WG” supposed to mean “Great” to differentiate it from the smallest 420, derived from the S-Type model. Indeed, this way of attributing names and numbering created a bit of confusion because the Mark was abandoned. A limited number of 420G was equipped with partition glass between the front and rear compartments.
When production ceased, in 1970, the new XJ sedan had been on the market for almost two years, which inherited a lot of stylistic solutions. The production of the MK X, which does not carry very high numbers, 13,382 MK X 3,800cc, 5,137 MKX 4,200cc, 5,763 MK 420G, maybe because it did not gained the hoped success, and only recently is recovering its proper role in history. A great high-quality sedan where beauty and luxury were at the top, just as Jaguar, under the supervision of Sr. William Lyons, who knew how to do things the right way. It was also the latest model of the brand to mount as standard the celebrated Jaguar mascot on the bonnet.