Rear Gear Questions
Thread Starter
Teching In
Joined: Nov 2002
Posts: 33
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From: Denham Springs, La.
Rear Gear Questions I have an 02 SS A4 car with 3.23 gears. Car turns about 2100 rpm at 70 mph. Want to increase performance without hurting daily driveability. Should I go with 3.42 or 3.73 gears? Is it worth it? Do they use the same carrier? How much of a decrease in et can be expected? What rpm will it turn at 70 mph with a 3.73? Possible torque converter change in the future so I need to keep them compatible.
Re: Rear Gear Questions go 3.73, it helps drivability and barely decreases mpg.
- uses same carrier
- probably around a .15 ET reduction
- about 2400rpms at 70mph in 4th
later,
Steve
- uses same carrier
- probably around a .15 ET reduction
- about 2400rpms at 70mph in 4th
later,
Steve
TECH Apprentice
Joined: Jul 2002
Posts: 388
Likes: 0
From: Batlimore, Maryland
Re: Rear Gear Questions What size tire are you planning on running. A larger tire diameter will reduce your over all gear ratio. If you are running a tire that is larger than the stock 245/50/16 or 275/40/17 which both equal about a 25.7 tire diameter I would say go with the 3.73 at the very least and possible look at going with 4.10's or even higher. The real question is what RPM and MPH do you want to be hitting at the end of the traps?
TECH Apprentice
Joined: Jul 2002
Posts: 388
Likes: 0
From: Batlimore, Maryland
Re: Rear Gear Questions 
Re: Rear Gear Questions i got an A4 and i swaped from the 3.23s to 3.73s and i love them. at 70 my rpms are at 3000, but i dont know if that is right because i put in white face gauges and i may have messed up the rpms. but im pretty sure that its right. and it wont hurt ur driveability. i drive my car about 60 miles every day. and i just took a 14 hour drive to illinois and a 14 hour drive back.
