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Car Forum / Chevrolet / Chevrolet Corvette / October 2007Performance Axle Ration
I'm getting ready to order a 2008 Convertible with paddle shift and am considering ordering the "2.73 Performance Rear Axle Ratio". Can anybody give me a description of what that is, and difference it makes in acceleration or speed? Is it worth $395? Thanks, Scott -- > I'm getting ready to order a 2008 Convertible with paddle shift and am > considering ordering the "2.73 Performance Rear Axle Ratio". Can anybody [quoted text clipped - 4 lines] > > -- 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. And on a car driven on the road, higher gas bills.  Signature1972 War Bonnet Yellow Corvette 1981 White Corvette 1995 Competition Yellow Corvette >> I'm getting ready to order a 2008 Convertible with paddle shift and am >> considering ordering the "2.73 Performance Rear Axle Ratio". Can anybody >> give me a description of what that is, and difference it makes in >> acceleration or speed? Is it worth $395? >> >> Thanks, Scott > 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. >>> I'm getting ready to order a 2008 Convertible with paddle shift and am >>> considering ordering the "2.73 Performance Rear Axle Ratio". Can [quoted text clipped - 9 lines] >> quicker launch, quicker run through each gear, and ultimately >> (theoretically) a lower top end speed. 2.73 does not seem like a performance ratio. Could it be 3.73? What is the standard ratio? Al >>>> I'm getting ready to order a 2008 Convertible with paddle shift and am >>>> considering ordering the "2.73 Performance Rear Axle Ratio". Can [quoted text clipped - 13 lines] > > Al 2.56 >2.73 does not seem like a performance ratio. Could it be 3.73? What is the >standard ratio? > >Al In an older car it wouldn't be but the six speed automatic makes up for it with a much lower first gear and wider range to the top. In a 2005 the rear gears from the factory are: auto: 2.73:1 or 3.15:1; manual: 3.42:1, limited slip. Would the be the same in a 2008? Signature1972 War Bonnet Yellow Corvette 1981 White Corvette 1995 Competition Yellow Corvette >> >>2.73 does not seem like a performance ratio. Could it be 3.73? What is the [quoted text clipped - 4 lines] > In an older car it wouldn't be but the six speed automatic makes up > for it with a much lower first gear and wider range to the top. nope for 2008 the auto is 2.56 or optional 2.73 and the manual gets 3.42 > In a 2005 the rear gears from the factory are: auto: 2.73:1 or 3.15:1; > manual: 3.42:1, limited slip. Would the be the same in a 2008? >In a 2005 the rear gears from the factory are: auto: 2.73:1 or 3.15:1; >manual: 3.42:1, limited slip. Would the be the same in a 2008? What Bob said. The difference is the 2005 had a 4 speed auto while the 08 has a 6 speed with a much wider range. See my other post below. I have a 2004 Auto with a 2.73 ratio. The good news: 21 MPG around town, 25 highway. The bad news: Could be faster, IMHO. A 2.73 rear end ratio IS NOT a "performance" item. It gives you better MPG and slower 0-60.....0-100 on up times. Helps Chevy meet their CAFE numbers. The higher the number, the more "performance" from the rear axle ratio. 2.73.....bad. 3.48...good 4.11....better Gas mileage?? Who cares. That's not why I have it. It's a 'Vette not a Vega! Bill > I'm getting ready to order a 2008 Convertible with paddle shift and am > considering ordering the "2.73 Performance Rear Axle Ratio". Can anybody [quoted text clipped - 4 lines] > > -- >I have a 2004 Auto with a 2.73 ratio. >The good news: 21 MPG around town, 25 highway. [quoted text clipped - 4 lines] >2.73.....bad. 3.48...good 4.11....better >Gas mileage?? Who cares. That's not why I have it. It's a 'Vette not a Vega! 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 manual. One other thing: 2004, Auto 1900 RPMS=105MPH w/ a 2.73 rear end. bill > I'm getting ready to order a 2008 Convertible with paddle shift and am > considering ordering the "2.73 Performance Rear Axle Ratio". Can anybody [quoted text clipped - 4 lines] > > --
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