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Hi Linda. 450 probably is accurate. It may be cheaper to find another entire rear end assembly and swap it in. You may be able to find a '66-'72 ten bolt safety-trac (posi) for around 400 dollars in a 3.36 ratio. A very easy, low tech job. You could ebay your 3.93 posi and more than make out. (steeper geared rear ends bring more $$). Sandu: 3.23 gears WILL NOT work in Linda's 4-series carrier. The lowest numerical ratio she can use is a 3.36 if she just changes the ring and pinion.
Jeff
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