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Originally Posted by JimGnitecki
There is one other negative associated with the 4.56 though: it is more likely than the 4.10 to raise the driveline nosie level to a point you might find objecitonable, due to the unfortunate sound properties of the stock driveshaft. This can be reduced or eliminated by changing to the driveshaft offered by Dennis Reinhart (do a search on his name or on "MMC driveshaft") to SSR Fanatics. That driveshaft is so superior in quality to the stock one that I reocmmend it for ALL SSRs, even those with stock gearing. You won't beieve the difference.
Jim G
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A couple of other thoughts on the 4.56 (not saying good or bad..), with the 4.56 you lose a grea tooth on the pinion 4.10 - 10, 4.56 - 9. This is part of why the 4.56 is noisier. Also, the 4.10 can be obtained from the GM factory supplier which will be quieter than an aftermarket set. The 4.56 is only available through the aftermarket suppliers.
