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Old 02-22-2011, 07:17 PM
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Many of the "odd-er" in-between ratio Ford 9" gears(of which your 3.75 ratio set is, the 3.70 is the common set) are targeted primarily at circle track racing use, to taylor engine rpm at the end of a straight to exactly what they need...and so tend to be noisier because no one cares how loud they are in a racecar as long as they do the job and last the race or the season.

The difference between the 3.70 and 3.75 ratio is something you would never even feel on a street or strip application...if you ran each set back to back you would have an extremely hard time telling the difference by how the car acts...if you could even tell, because the difference is sooo small.

I think the common 3.70 set would be your best choice for a quiet gear.
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