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performance axle or regular???

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Old Jul 9, 2008 | 09:49 PM
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Default performance axle or regular???

Considering the performance axle (automatic) over the regular.

How many extra RPM's does that equate to when driving at about 70mph in top gear? If my math is right, it should be about +120RPM??
I'm lousy at math...please help!
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Old Jul 10, 2008 | 12:59 AM
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Approximately 100 rpms. 1550 vs 1650.

http://mysite.verizon.net/foofoo2/c6/
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Old Jul 10, 2008 | 08:37 AM
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It only made 50 rpm difference in mine. Had an 07 with 256, ran 1750rpm at 80. My 08 runs 1800 at 80 with the 273.
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Old Jul 10, 2008 | 09:16 PM
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Originally Posted by BSE1956
Considering the performance axle (automatic) over the regular.

How many extra RPM's does that equate to when driving at about 70mph in top gear? If my math is right, it should be about +120RPM??
I'm lousy at math...please help!
Really not enough gear difference to have impact on gas or speed
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Old Jul 13, 2008 | 08:57 AM
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Originally Posted by JimTN
Approximately 100 rpms. 1550 vs 1650.

http://mysite.verizon.net/foofoo2/c6/
WOW! Great Post.
thanks for the info.
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Old Jul 13, 2008 | 10:47 PM
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I get the same gas mileage as the window sticker says (most of the time, if I behave myself). I have the 3.15 "performance axle" with the Z51 option and automatic.
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