Hi Don
Working inside a differential is NOT for the amateur. Not only are
several special tools required but much know-how regarding the whole process.
Over the years, Chrysler has used ring and pinion sets for such ratios
as 2.56, 2.71/76, 2/93/94, 3.21/23, 3.55, 3.91, 4.11, 4.55 and in the muscle
car heyday there were a few others in the range from 3.55 thru 4.55. As to
whether any of these are what you want and if they are still available and
would fit your truck you should consult a knowledgeable shop that specializes
in doing axle work
Paul Sahlin
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