Jeep was never owned by GM. Jeep, when produced by Kaiser and then AMC, used a combination of parts from the Big Three, plus in-house parts from AMC.
The AMC 327 (yes, it's an AMC-built engine!) came out in the 1956 Hudson and Nash cars, as well as the Ramblers sold by both companies. Nash bought Hudson in early 1954. The combined two were called American Motors Company. On 1 May 1954, Hudsons built after that shared the main body structures with the Nashes, but had unique interiors, engines, and body panels. Hudsons continued to use the Hudson 202 and 308 flathead Sixes, as well as the AMC 327 and the Packard 352 V-8 ('56 only for the Packard and the rotten UltraMatic). The last Hudsons and Nashes rolled off the line in Kenosha on 14 Oct 1957 as 1957 models. The Rambler was the only full-sized car sold by AMC after that. AMC contined to sell Metropolitans until 1962. Mets are often mistakenly called Nash Metropolitans for all years, though they wore Nash or Hudson badges from 1953-1957, then were just Metropolitans after that (though they say "American Motors" on the underhood VIN tag).
What does this have to do with Jeep sixes. Nothing. Just thought I'd share a little AMC history with ya!
