3:15 rear
Race Director
Joined: Apr 2005
Posts: 11,138
Likes: 11
From: Fremont CA
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
NCM Sinkhole Donor
2.73 is standard with an A/T and the 3.15 is the optional performance upgrade. All manual's came with 3.42's
Bigger rear end means faster acceleration / seat of your pants take-off.
Smaller rear end means higher top speed and better gas mileage.
Bigger rear end means faster acceleration / seat of your pants take-off.
Smaller rear end means higher top speed and better gas mileage.
Melting Slicks
Joined: Feb 2004
Posts: 2,819
Likes: 1
From: Toledo Ohio
CI 6-7-8-9 Veteran
St. Jude Donor '07
Originally Posted by doje
2.73 is standard with an A/T and the 3.15 is the optional performance upgrade. All manual's came with 3.42's
Bigger rear end means faster acceleration / seat of your pants take-off.
Smaller rear end means higher top speed and better gas mileage.
Bigger rear end means faster acceleration / seat of your pants take-off.
Smaller rear end means higher top speed and better gas mileage.
Let me add that the housings are different (2.73 vs the rest.)
So if you have a 2.73 and want to change I say go with 3.42.
Just my$.02
Race Director
Joined: Sep 2004
Posts: 17,786
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From: Redsox, Pats, Celts & Bruins !!! Redsox Nation !!!
St. Jude Donor '06-'07-'08-'09-'10-'11-'12
Originally Posted by SirCoryM
on the A4, with everything else considered constant, what is a reasonable guess for the 1/4 mile difference between 2.73s and 3.15s?
Depends on the driver, really nothing big, IMHO
Race Director
Joined: Apr 2005
Posts: 11,138
Likes: 11
From: Fremont CA
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
NCM Sinkhole Donor
Originally Posted by SirCoryM
on the A4, with everything else considered constant, what is a reasonable guess for the 1/4 mile difference between 2.73s and 3.15s?
Team Owner
Joined: May 2005
Posts: 23,682
Likes: 9
From: Flagstaff Az.
rear ends
The numbers are the ratios of the number of times the driveshaft turns for one revolution of the axle. So a 3:15 would spin the axle one time for every 3.15 turns of the driveshaft. A 4:10 would turn the axle one time for every 4.1 times the driveshaft turns. The higher numbers give you more power, less MPH.
