3.73s or 4.10s?

**dfillmore827** · 02-11-2008, 05:58 PM

im trying to decide wether or not to get 3.73s or 4.10s. my car is an A4 and a daily driver. im leaning towards 3.73s 4 gas reasons and how much should i pick up in the quarter and which brand should i get?

**Hot Black Trans-Am** · 02-11-2008, 11:49 PM

3.73 gets my vote.

**Jays00ss** · 02-12-2008, 06:07 AM

3.90's are always an option if you want a little more gear. I think they would be awesome with an auto. I went against the norm and put 4.30's in with my 6 speed.

**Hot Black Trans-Am** · 02-12-2008, 09:31 PM

Originally Posted by Jays00ss

3.90's are always an option if you want a little more gear. I think they would be awesome with an auto. I went against the norm and put 4.30's in with my 6 speed.

I was trying to decide between 4.56 or 4.10, but I'm thinking of doing the 4.30's too. What kind of RPM are you getting at 75 in 6th?

Sorry for the thread jack!

**Blue_98_ws6** · 02-12-2008, 09:36 PM

wondering the same thing ive got an A4 3:73 or 4:10 but i wanna still be able to hit those high highway speeds

**Hot Black Trans-Am** · 02-12-2008, 09:38 PM

Nah, 75 is cruising speed. The high highway speed part is about 95 and up.

**408WS6** · 02-13-2008, 07:56 PM

3.73's. 4.10s may or may not get you better et's. If you can hook with 4.10s and not run out of gear at the end of the track, then 4.10s are better. But I like 3.73's because they're all around a good gear for the street and track. And when you start making big power with your motor later on you might wish you still had 3.73's.

**N20LT4** · 02-13-2008, 08:01 PM

Originally Posted by Jays00ss

3.90's are always an option if you want a little more gear. I think they would be awesome with an auto. I went against the norm and put 4.30's in with my 6 speed.

What manufacturer makes the 3.90 set for the stock rear-end? I knew I saw them but couldn't remember who made them?

**MnLS1** · 02-14-2008, 04:37 AM

w/ 4.10's, I'm just about redlined (3rd gear) in the 1/8th @ 90mph, 60 mph in 6th at about 1700 rpm, this is w/ and M6 though

**shady milkman** · 02-14-2008, 04:42 AM

4l60e for all around drivability and performance like the 3.73 -3.90...4.10+ is usually for the t56s

**67CamaroRSSS** · 02-14-2008, 05:59 PM

I have 3.73's in my A4 car. Good compromise between driving and racing.

**Jays00ss** · 02-15-2008, 07:39 AM

Originally Posted by Hot Black Trans-Am

I was trying to decide between 4.56 or 4.10, but I'm thinking of doing the 4.30's too. What kind of RPM are you getting at 75 in 6th?

Sorry for the thread jack!

At 75 MPH in 6th gear I turn 2150 RPM with 295/25/18's in the rear

Originally Posted by N20LT4

What manufacturer makes the 3.90 set for the stock rear-end? I knew I saw them but couldn't remember who made them?

Motive Performance makes a 3.90 gear for the stock 10 bolt.

**Spaz** · 02-15-2008, 07:46 AM

Originally Posted by dfillmore827

im trying to decide wether or not to get 3.73s or 4.10s. my car is an A4 and a daily driver. im leaning towards 3.73s 4 gas reasons and how much should i pick up in the quarter and which brand should i get?

3.93 and a nice cam!!!

**LS2Tuner** · 02-15-2008, 08:01 AM

Well since you said it's a daily driver there would be only one Smart choice.
3.73 are it!

4.10's would be fine if you had a weekend warrior.
On the brand ? Just get a quality AMERICAN gear/ There are MANY out there now including Sumit ang Jegs that are a good price.
And for the others that are hi jacking your thread...... You need to know your tire dia..... http://www.angelfire.com/fl/procrastination/rear.html
http://www.csgnetwork.com/multirpmcalc.html
http://www.5speedtransmissions.com/calculators.html

Those are the 3 different calculators I use.

**slims00ls1z28** · 02-15-2008, 09:00 AM

4.10's aren't bad with an auto. I have them in mine. 85 mph is around 3K RPM's. First gear is useless on the street especially with a 3600 stall and street tires. Come to think about it so is second. Haven't run it at the track yet as the motor let go 3 days before I was going to take it. I'd do it again in a heartbeat if I had to do it all over again. I only drove it on the weekends but that was more because of the Headers/true duals/flowmaster 1 chambers dumped at the axle more than anything else. Cops hated it, so did anyone's house I passed by.

**LS2Tuner** · 02-15-2008, 09:16 AM

Originally Posted by slims00ls1z28

4.10's aren't bad with an auto. I have them in mine. 85 mph is around 3K RPM's. First gear is useless on the street especially with a 3600 stall and street tires. Come to think about it so is second. Haven't run it at the track yet as the motor let go 3 days before I was going to take it. I'd do it again in a heartbeat if I had to do it all over again. I only drove it on the weekends but that was more because of the Headers/true duals/flowmaster 1 chambers dumped at the axle more than anything else. Cops hated it, so did anyone's house I passed by.

Yeah 4.10's aren't bad unless you are talking about your daily driver.
Most public hate 1 chambers!

Even more if they are 3.5" behind a 12.5:1 Big Block.

**mghawk57** · 02-20-2008, 06:29 AM

3.73 here - Greatest feeling when accelerating.

**Midnight02** · 02-22-2008, 01:31 PM

I have Motive 3.90's in my M6 and love them, although I will definitely go with something higher when I swap to a 9" rear.

Since you have an A4 daily driver, the 3.73 should be a great fit for you. You'll definitely notice a difference when playing around on the highway. Match that with a good stall and you should post nicely improved track times.

**Jays00ss** · 02-22-2008, 03:18 PM

Originally Posted by Midnight02

I have Motive 3.90's in my M6 and love them, although I will definitely go with something higher when I swap to a 9" rear.

Since you have an A4 daily driver, the 3.73 should be a great fit for you. You'll definitely notice a difference when playing around on the highway. Match that with a good stall and you should post nicely improved track times.

sorry to thread hyjack, I had 3.90's in my 10 bolt. Went with 4.30's in my 9" and I am glad I did. I love them.