373 or 390
Launching!
Joined: Sep 2009
Posts: 260
Likes: 0
From: SOUTH CAROLINA
Hi,i would go with 3.73 to keep power/torque/rpm range in check.
To tall on the gears and you run out of rpm's before going into lights.
Tire size will also have an effect on your overall ratio. Check out wallace racing calculator to compare and judge for yourself. Best of luck with the install. Have a blessed day............jim
I'd go with 3.73s since you have an A4.
Aluminum driveshafts seem to be balanced better and save you a few pounds. My 3rd gen rode smoother at highway speeds with the AL DS.
But...from a strength standpoint you're better off saving up for aftermarket.
Aluminum driveshafts seem to be balanced better and save you a few pounds. My 3rd gen rode smoother at highway speeds with the AL DS.
But...from a strength standpoint you're better off saving up for aftermarket.
TECH Fanatic
Joined: Jan 2011
Posts: 1,358
Likes: 0
From: Michigan
Their was somewhere I read about how 3:90s were not good for a4s awhile back, Something different about whats involved in the install and it wasn't good, can't remember but that's why I went with 3:73s and love them
Teching In
Joined: Mar 2011
Posts: 36
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TECH Fanatic
Joined: Jan 2011
Posts: 1,358
Likes: 0
From: Michigan
With 2:73s I had before I was running 1900rpm at 70-72mph
With 3:73s I now run 1900 rpm at 55-57 mph...and 24-2500rpm at 70 mph.
It was a fair trade off, and with running alittle higher rpms your / atleast my exhaust sound 2x better, and it feels 2x faster by far
With 3:73s I now run 1900 rpm at 55-57 mph...and 24-2500rpm at 70 mph.
It was a fair trade off, and with running alittle higher rpms your / atleast my exhaust sound 2x better, and it feels 2x faster by far
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They install the same and require the same rebuild kit. You may have read about the difference in teeth size, 3.90 are weaker. Something else should break before the ring and pinion in a 10 bolt tho.
