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From: Daven Anderson
Date: March 09, 2001
Sure thing,Brian. The standard ratio for the L6 stick cars was 3:73 (4:10 for overdrive-equipped or 'mountain area' cars).
The shop manuals were written before production started,so they don't cover running changes in production that are covered in the all-important dealer service bulletins! See now James may have the 3:36 or 3:31 ratio even though the shop manual would say 3:54, because of the midyear running changes (listed in my reply to his post).
Your six/stick car could very well have a factory 8¾" rear. In fact,it was supposed to if the axle was 4:10 (or 4:56 special order). Even for a 3:73 ratio,the factory would use 8¾" rears if that was specified on the order,or even substitute the 8¾" if the factory happened to run out of the regular rear axles that week. I've seen musclecar-era Mopars where the Dana 60 rearend was fitted at no extra charge because the factory was out of the 3:55 8¾" rears that week! My grandmother's '66 Charger was one such car,but I've seen others.