A4 3.73's or 4.10's? Guys with experience please chime in!

01SOMZ28 · 07-20-2009, 09:33 PM

I have 3.73's waiting to be installed but i'm having second thoughts if i should go with 4.10's. I'd like some of you guys with experience with the two gears in A4 cars to please chime in.

jetlag · 07-20-2009, 09:47 PM

What size tire?

What shift points?

My car with 26" tires, 6100shifts, and 3.73s, I was running out of gear at 120mph not shifting into overdrive.
I went to 3.50 gears..hah

99Ls1fever · 07-20-2009, 10:22 PM

How much does 3.73 gears help ET wise in a Stock F body? .2 tenths?

Kevin01Z28 · 07-20-2009, 10:34 PM

If you do a fair amount of driving on interstate I would say stay with 3.73s. I ran them for awhile and topped out around 130 - 135 in third. I was running a 2000 stall though. Not sure what kind of gears you are running now but if they are 2.73 thats a big jump and it will easily net you more than .2 in the quarter. If you are running a big stall the gains will be less.

Im about to run 4.10s once my 96 project is finished. Not by choice only because thats what was in the rear I bought for 50 bucks and im not spending the $$ to change em out. Im just gonna save and get a 12 bolt in a couple of years.

99Ls1fever · 07-20-2009, 10:36 PM

I belive they are 3.23's 2000 WS6. I am not positive, but that is what I think they are. What ET gain do you think I would grab with 3.73's?

MelScrilla · 07-20-2009, 10:39 PM

i just bought a car with 4:10's in an A4 and i love it for the street. Since i just got the car like 4 days ago i havent had a chance to get to the track yet.

4:10's would probably do real good in the 1/8 but on the 1/4 it would probably put you into OD if your shift point isnt pretty high.

Kevin01Z28 · 07-20-2009, 10:42 PM

Quote:

Originally Posted by 99Ls1fever

I belive they are 3.23's 2000 WS6. I am not positive, but that is what I think they are. What ET gain do you think I would grab with 3.73's?

Yea it should be 3.23's. You are probably close on saying .2 gain, maybe .3.

99Ls1fever · 07-20-2009, 10:42 PM

Quote:

Originally Posted by MelScrilla

i just bought a car with 4:10's in an A4 and i love it for the street. Since i just got the car like 4 days ago i havent had a chance to get to the track yet.

4:10's would probably do real good in the 1/8 but on the 1/4 it would probably put you into OD if your shift point isnt pretty high.

I would Imagine Good 60 foots!

Quote:

Originally Posted by Kevin01Z28

Yea it should be 3.23's. You are probably close on saying .2 gain, maybe .3.

Yeah I was just interested to see how much it would help, this is my first A4 Build. All the others have been M6's.

jetlag · 07-20-2009, 11:03 PM

I gained 0.1 and 1.5mph going from 2.73 to 3.73.

99Ls1fever · 07-20-2009, 11:07 PM

Thanks for the info

It helps to put it in to perspective on which way to go.

RaggedRides · 07-20-2009, 11:22 PM

Quote:

Originally Posted by jetlag

I gained 0.1 and 1.5mph going from 2.73 to 3.73.

...along with those heavy ass ZR1s and Eibachs.

99Ls1fever · 07-20-2009, 11:25 PM

What did you pick up et wise?

nomoneyz · 07-21-2009, 12:00 AM

I haven't had mine to the track but I went from 2.73's to 4.10's and it is bad ass on the street. Definately take out a lot of cars from stop light to stop light. Highway isn't so bad about 3000-3200 at 80 with stock size tires. And my milage didn't change much at all. I do go into overdrive pretty quick though. But when do I really drive 110? It all depends on your idea of driveable. I love it cause the car moves out soooo good from a dig. I'm not into high high speeds so it was the right choice for me.

MelScrilla · 07-21-2009, 01:46 PM

Quote:

Originally Posted by nomoneyz

I haven't had mine to the track but I went from 2.73's to 4.10's and it is bad ass on the street. Definately take out a lot of cars from stop light to stop light. Highway isn't so bad about 3000-3200 at 80 with stock size tires. And my milage didn't change much at all. I do go into overdrive pretty quick though. But when do I really drive 110? It all depends on your idea of driveable. I love it cause the car moves out soooo good from a dig. I'm not into high high speeds so it was the right choice for me.

I agree definetly mean on the street but i just ran the car wot today and it topped out at about 120ish at the stock rev limiter. I should get to the track pretty soon hopefully tomorrow night I'll get to run in the 8th where theres gears will really work.

99Ls1fever · 07-21-2009, 02:16 PM

Keep us Posted with the Track Updates!

chrs1313 · 07-21-2009, 02:18 PM

i vote 4.10s with 28" tall...that would be about the same ratio as 3.73s and 26s....but will give you better traction at the track...

01ssreda4 · 07-21-2009, 05:26 PM

Quote:

Originally Posted by jetlag

I gained 0.1 and 1.5mph going from 2.73 to 3.73.

I gained 2.5 mph going from a 3.23 to a 3.73. I believe 3.73s are the right choice for an auto.

99Ls1fever · 07-21-2009, 11:51 PM

Quote:

Originally Posted by 01ssreda4

I gained 2.5 mph going from a 3.23 to a 3.73. I believe 3.73s are the right choice for an auto.

Thats Awesome! What was your ET Differance?

james562 · 07-21-2009, 11:58 PM

I have a stock 3.42 rear end in my car and have gone 1.42 60" on a tiny drag radial.

3.42's work good for me

Im curious what I would gain going to 3.73's or 4.10/4.30's and a 28" radial?
Its already hard enough to hook this thing on the spray off the line. Im thinking the gears may hurt me.

01ssreda4 · 07-22-2009, 12:09 AM

Quote:

Originally Posted by 99Ls1fever

Thats Awesome! What was your ET Differance?

track was slick that night so i couldn't cut a decent short time. MPH difference was vs. previous runs with 3.23s and dead hooks off the line on multiple occasions