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A4 guys, what gear?

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Old Feb 7, 2007 | 10:36 PM
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Default A4 guys, what gear?

What rear gear are most of you guys running? My current setup is stock 3.15's and 305/45-18 nitto dr's which measure closer to 29 then 28" tall.

Im trying to decide if i should go w/ 3.73's or 3.90's. Im thinking 26" tires and 3.73's like I ran on my SS is about the most gear I want from a street car. But 3.90's if I stick w/ the 305/45's, which is probably about the same as 3.73 and 26's.

Is that about the same as most of you that drive your cars alot?



I guess my real dilemna is between 315/30's vs 305/45's. I think im gonna pick the 315's and lower it for looks compared to the oversized and raised up look of the 305's. This is more of a nice weather fun car vs. a drag car for me.

It still needs tuned but looking for 450 n/a and 600 on the bottle, if that makes any difference.
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Old Feb 8, 2007 | 05:46 PM
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Probably best bet is the 3.73

I have run with 4.10 and currently have 3.90 but mileage bites big time. Cannot beat the launches when mated to the 5000 stall converter though
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Old Feb 8, 2007 | 11:31 PM
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I only have a 2800 in it now thats why i'd kinda like to run a 3.90 w/ 26's but it might be too much for alot of highway cruising

I think im gonna do 3.73's and 26's but I need to figure out where that limits my trap speed first.
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Old Feb 11, 2007 | 02:03 AM
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I've been happy with 3.42's. All depends what you want out of the car.
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Old Feb 11, 2007 | 09:39 AM
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the 373 will give you a better time at the track
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Old Feb 11, 2007 | 11:46 AM
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Default I have 373

I run 119 mph in 3rd at the track
Mark (mdhmi) runs mid 130's or more ,he needs to keep the car in 3rd so less gear is better
My vette is H/C driven anywhere and the 373 are tops
Figure your top speed in the 1/4 in 3rd and adjust your gear accordingly
If you will be on the freeway on long trips the 373 gives you about 26 mph
My 315 with stock motor managed 31
This might also be a consideration .
JOhn
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Old Feb 11, 2007 | 04:51 PM
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3.90's all the way baby!!!
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Old Feb 11, 2007 | 05:03 PM
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I put a 373 gear in mine now I had a 342 and the best I had ran with the 342 gear was a 10.07 with the new 373 i ran a 9.75 so gear makes a big difference and I have over 700 rwhp and the 373 gear in it i went threw the traps yesterday at 144mph at 6500 rpms
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Old Feb 11, 2007 | 05:34 PM
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I have a 05 c6 with a 3200 stall and 373 gears in my a4 and it works fantastic
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Old Feb 13, 2007 | 11:36 PM
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Fastest heads/cam A4 C5s that I have seen run the 1/4 mile have had 3.90s or 4.10s. Do the 3.90s and call it a day!!
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