Sure, this principle is the same in all vehicles, although there are many
other contributing factors that alter the details. Generally, a lower gear
ratio (3.55/1 being a lower gear ratio than 3.00/1) reflects a quicker
launch, quicker run through each gear, and ultimately (theoretically) a
lower top end speed.
On or about Tue, 23 Oct 2007 23:05:57 -0500, "bill kolofa"
The final gear ratio is a combination of the gears in the transmission
and the differential. The higher the number the faster the car
accelerates and the worse the gas mileage. Your 2004 automatic with a
2.73 differential has the following ratios: (gear/transmission/final)
1st 3.06 8.35
2nd 1.63 4.45
3rd 1.00 2.73
4th 0.70 1.91
The C6 Z06 (which I think most would consider has a performance
transmission has a 3.42 differential which results in:
1st 2.66 9.097
2nd 1.78 6.088
3rd 1.30 4.446
4th 1.00 3.420
5th 0.74 2.531
6th 0.50 1.710
It has more low end grunt and better top end mileage than your 2004.
Now for the 2008 automatic. The first final ratio is for the standard
2.56 differential and the second is for the 2.73.
1st 4.027 10.309 10.994
2nd 2.364 6.052 6.454
3rd 1.532 3.922 4.182
4th 1.152 2.949 3.145
5th 0.852 2.181 2.326
6th 0.667 1.707 1.821
In other words, leaving the line the standard automatic with the 2.56
is equivalent to a Z06 manual with a 3.88 differential and the 2.73
auto would be a 4.13 differential. As far as mileage, the standard
auto and manual are the same ratios while the 2.73 would be a 3.64
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