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ring & pinion ?

Old 03-16-2007, 03:17 PM
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recently acquired a Fd diff unit which possibly has a 4.55 ring and pinion

the ring has 41 teeth and the pinion 9 hence 4.55

the stamping on it is po8 and paint marks are 61 and 3.

can someone compare to a 4.30 ring and pinion set????
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Old 03-20-2007, 05:59 PM
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A 41/9 is commonly referred to as a 4.56.
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