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Old 02-25-2006, 05:17 AM   #1 (permalink)
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Your opinion re: diff swap

Buddy of mine owns a C6 Mallett Hammer. This is a Z51 C6 with a sweet cam, head job, new exhaust, engine tune, Pensky shocks & other suspension tweeks. The final drive ratio is the same as a stock C6. He tracks the car about 10-times per year (VIR & Summit Point).

He's thinking of swapping out his rear gears to get it around the track a bit quicker and make it a bit more fun on the street too. So here are the questions:

Other than an increase in RPM's at every MPH & bad gas mileage, what's the downside?

How do you predict results before buying to assess the value of the swap? Is there a way of calculating expected revs?
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Old 02-25-2006, 06:18 AM   #2 (permalink)
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There's an article in the March '06 Car & Driver on an '05 SLP C6 with the 4 speed auto. It has a 3:90 diff in it and they seem very impressed with it. Tell him to check it out.
The effect will be more radical with the M6.
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