![]() The fourth number represents the engine type:ĥ7348-10001-21157 CJ-3B Universal Jeep - Open Bodyĥ7448-10001-11366 CJ-3B Universal Jeep - Stripped Chassisĥ7548-10001-23232 CJ-5 Universal Jeep - Open Bodyĥ7648-10001 and up CJ-5 Universal Jeep - Stripped Chassisįor 1956, they changed the definition again: The second and third number represents the series and body style. OB Jeeps were simply Jeeps with bodies."įor the 1954 model year, Service Bulletin 328 lists: ![]() There were 2 standard types (besides the special models like the Fire Jeeps) of Universal Jeeps: Open Body and Stripped Chassis. Todd comments, "The breakdown of the prefix for the 19 model years finally answers the question. And see CJ-3B Serial Numbers and Production Figures for details on the old 1950-54 VIN series.) (See some speculation about that in the discussion further down on this page. However, it doesn't state that fact explicitly, nor does it offer an explanation of why the prefix was used for only the first 2,600 Jeeps of 1954, before Willys returned to the 454GB2 series in use since 1950. Todd Paisley's 2004 unearthing of Service Bulletin 328 dated 18 October 1956 and titled "Identification of Willys Vehicles" provides pretty strong evidence that the "OB" serial number prefix used briefly in 1954 indicated simply the standard "Open Body."
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