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  • The General Motors K platform was the automobile platform designation used for the rear wheel drive Cadillac Seville models from 1975 to 1979. The rear-wheel drive K platform was based closely on the very similar 4th generation GM X platform, and 2nd generation F-bodies of the 1970s, all of which shared many components in common. The K platform stretched the X platform to 114.3 inch wheelbase, but also improved isolation from sources of structure borne vibration in the drivetrain and suspension. While automobiles built on these three platforms had different bodies, they shared the same unibody construction technology using a separable elastomer isolated front subframe assembly, a design which first appeared in GM vehicles on the 1st generation X platform in 1962 on the Chevy II. Automobiles built on these three platforms also shared front and rear suspension systems, with tunings engineered to each application. The front suspensions used unequal length A-arms, coil springs damped with tubular hydraulic shock absorbers, ball joints, elastomer bushings, and recirculating ball steering boxes differing in ratios that were specific to the application.