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Old 02-08-2015, 06:04 PM   #11
SS Tim
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Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,504
Re: Frame differences

Since my at hand data is showing 36K?-39K up through '85 it probably remained the spec. until the T400s were released. Even then they probably remained longer with the legacy models like the Crew Cabs Subs and Blazers.
Sombody needs to buzz Kieth on that answer.
If you are thinking about Big Red its probably a 39k frame.
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