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[edit] Re-Engineerings

and had at least 5 major re-engineerings, in 1959, 1965, 1971, 1977, and 1991.

What was major about 1991? The bodies were way different, but the chassis components are interchangeable from 77 right through 96. What is the definition of "re-engineering" in this case? 74.101.94.34 23:17, 16 September 2007 (UTC)