3.73s or 4.10s?

[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?

[Hot Black Trans-Am]

3.73 gets my vote.

[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.

[Hot Black Trans-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.


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]

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]

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

[408WS6]

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]

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]

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]

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

[67CamaroRSSS]

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

[Jays00ss]

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

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]

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]

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.:usa:

[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.

[LS2Tuner]

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

[mghawk57]

3.73 here - Greatest feeling when accelerating.

[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.

[Jays00ss]

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.

[jasonpg1300]

4.30 rock in a m6

[konigandy6]

What kind of top speed is lost with going with 4.10's. I'm torn between the 3.73's and the 4.10's. How quickly afterwards did you get your cars tuned?

[xzaero0]

Either way say good bye to the stock 10 bolt. Having a Moser 9" installed this week went with the 3.70s

[LS2Tuner]

The key to keeping the life of your 10 bolt is to allow some spin or make it NOT dead hook which can be manipulated with tire pressure in the drag radials.

[N20LT4]

For anyone who has either ran a 3.90 ratio in an A4 or knows somebody running them, are they doable in a regularly driven street car??? They look to sit very nicely in between 3.73's and the more track friendly 4.11's. I have a friend that's running 4.11's in his '95 Z28 A4 and it is impractical on the highway.

[LS2Tuner]

For anyone who has either ran a 3.90 ratio in an A4 or knows somebody running them, are they doable in a regularly driven street car??? They look to sit very nicely in between 3.73's and the more track friendly 4.11's. I have a friend that's running 4.11's in his '95 Z28 A4 and it is impractical on the highway.

I had 3.91 in my A4 Goat and yes they were fine with a 275/40/17. It all depends on the tire too. I NEVER run a short rubberband on anything.:yup:

[underated98z]

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

Thats strange I have 4.10's and in the 1/8 in 3rd gear I am in the redline. I have to switch to 4th in the 1/8 mile. Thats with 17's on it. In the 1/4mile I am still in 4th at around 6200rpm. 3.90's would be perfect for my car

[666ws6]

I'm curious abour 3.90s too for an A4. I'm considering gears as my next mod. And 3.90s might be a good mid point but siding more on performance.

I only drive the car on weekends and for cruising around. I may take it to the track here and there (best ET 12.6s 1/4 mile). Car has most mods except heads. 3500 stall TC.

[ananmech]

guys Im knew at this i really i wanna what do you mean by stalling the car 3000 ,3200 what are these number and how do you stall? i wanna go for 3.73 but i dont know how many bolts do i have? all i know is that i have A4 T/A formula 2001 i have a ram air but it doesnt say that it's a WS6 at the back....please need help

[rc74racer]

guys Im knew at this i really i wanna what do you mean by stalling the car 3000 ,3200 what are these number and how do you stall? i wanna go for 3.73 but i dont know how many bolts do i have? all i know is that i have A4 T/A formula 2001 i have a ram air but it doesnt say that it's a WS6 at the back....please need help

The stall people are refering to is a converter in your transmission. When people say 3000/3200 they are referring to the RPM you converter uses to fully engage your transmission under full accelaration. It's kind of like reving the motor before you take off. Someone who is an automatic guru may have a better way of explaining this. I believe the stock converter is in the 2000-2200 neighborhood. When people change to a higher stall it's so they can launch the car at higher rpms. For the street 3000-3200 is as high as I would go.

Bolt ons refer to mods that you can bolt on to your car like, headers, y pipe, intake, catback, etc... basically external engine mods. If your car is stock you have none.

3.73s is the way to go for an A4 especially a daily driver.

[shady milkman]

stock stall is around 1600 rpm. alot of people here say go 3600 :yup: i will be doing this soon. 3600 with a tune is streetable

[konigandy6]

guys Im knew at this i really i wanna what do you mean by stalling the car 3000 ,3200 what are these number and how do you stall? i wanna go for 3.73 but i dont know how many bolts do i have? all i know is that i have A4 T/A formula 2001 i have a ram air but it doesnt say that it's a WS6 at the back....please need help

The Fbody came with a 10 bolt rear end. I am assuming that is what you were asking.... If you have an auto car, 3.73 is probably your best bet for gear selection. If you want to know if your car is a real WS6, check the RPO code sticker in the door.

[ananmech]

would this fit in my T/A

Ring and Pinion Ratio: 3.73:1
Cover Bolts: 12
Ring Gear Bolts: 12
Pinion Spline Count: 30
Carrier Series: 3
Ring Gear Rotation: Standard
Ring Gear Teeth: 41
Pinion Gear Teeth: 11
Ring Gear Diameter (in): 8.875 in.
Pinion Shaft Diameter (in): 1.625 in.

[LS2Tuner]

would this fit in my T/A

Ring and Pinion Ratio: 3.73:1
Cover Bolts: 12
Ring Gear Bolts: 12
Pinion Spline Count: 30
Carrier Series: 3
Ring Gear Rotation: Standard
Ring Gear Teeth: 41
Pinion Gear Teeth: 11
Ring Gear Diameter (in): 8.875 in.
Pinion Shaft Diameter (in): 1.625 in.

NO!

http://www.jegs.com/i/Richmond+Gear/836/49-0007-1/10002/-1/744482%7C10167

http://www.jegs.com/i/Richmond+Gear/836/49-0046-1/10002/-1/744482%7C10167

One of these two depending on what your stock gear is.

You have a 7.5" 10 bolt.

[jimmybling31]

stock stall is around 1600 rpm. alot of people here say go 3600 :yup: i will be doing this soon. 3600 with a tune is streetable

eh. 3600 is too high in my opinion. 3000 or 3200 is great.

back on subject. you will not get good gas mileage at all with a 3.90 gear. with a 3.73 you won't either. after a little playing with a calculator a 3.90 would be perfect for my car in the quarter and a 4.11 would be perfect for an 1/8 for mine. I run 1/8 no 1/4, but I drive my car on the street so much that I can't even justify any more than a 3.42 gearing. if you hardly go to the strip i would weigh the fact that you are going to be paying alot more on gas. not saying that 3.73 wouldn't be nice or a 4.10 wouldnt be nice. I had a 4.10 for a week and couldn't afford the gas. i had to fill up 3 times in one week when with a 3.23 I fill up once a week.

[ananmech]

NO!

http://www.jegs.com/i/Richmond+Gear/836/49-0007-1/10002/-1/744482%7C10167

http://www.jegs.com/i/Richmond+Gear/836/49-0046-1/10002/-1/744482%7C10167

One of these two depending on what your stock gear is.

You have a 7.5" 10 bolt.

if i buy this part? do i need anything else with it? like driveshaft or torque covertor...or anything else ..

[rc74racer]

if i buy this part? do i need anything else with it? like driveshaft or torque covertor...or anything else ..

You will need gear lube and a installation kit.

[rc74racer]

eh. 3600 is too high in my opinion. 3000 or 3200 is great.

back on subject. you will not get good gas mileage at all with a 3.90 gear. with a 3.73 you won't either. after a little playing with a calculator a 3.90 would be perfect for my car in the quarter and a 4.11 would be perfect for an 1/8 for mine. I run 1/8 no 1/4, but I drive my car on the street so much that I can't even justify any more than a 3.42 gearing. if you hardly go to the strip i would weigh the fact that you are going to be paying alot more on gas. not saying that 3.73 wouldn't be nice or a 4.10 wouldnt be nice. I had a 4.10 for a week and couldn't afford the gas. i had to fill up 3 times in one week when with a 3.23 I fill up once a week.

Gas mileage won't go down that much. No way 410s made your car use 3 times as much gas. Most guys are not seeing huge changes in fuel mileage going to 373s. I lost 1mpg going to 410s but that's with an M6.

[jimmybling31]

Gas mileage won't go down that much. No way 410s made your car use 3 times as much gas. Most guys are not seeing huge changes in fuel mileage going to 373s. I lost 1mpg going to 410s but that's with an M6.

i know how much I lost. it wouldn't go below 3400 on the highway. i used a ton of gas with those gears. It also was annoying with the engine at such high rpms when you are on the highway all the time. another thing that caused it for me was it's hard to stay out of it when you can smoke the tires whenever you want to. heck with a 4.10 on there I was able to spin the tires from a 45 roll

[LS2Tuner]

if i buy this part? do i need anything else with it? like driveshaft or torque covertor...or anything else ..

Depending on your car..................?

If it has 75,000+ on it I would replace ALL the bearings at the same time. Which basically would be a Complete installation kit. No driveshaft or tq conv. replacement needed. I would have some new U-joints put in and have the drive line re balanced or at least the balanced checked.
If you plan on ever making the car "dead hook" on some drag radials I would also buy a diff cover that has a "girdle style" system to halp pre load the carrier caps and keep it square.

[ananmech]

Depending on your car..................?

If it has 75,000+ on it I would replace ALL the bearings at the same time. Which basically would be a Complete installation kit. No driveshaft or tq conv. replacement needed. I would have some new U-joints put in and have the drive line re balanced or at least the balanced checked.
If you plan on ever making the car "dead hook" on some drag radials I would also buy a diff cover that has a "girdle style" system to halp pre load the carrier caps and keep it square.

Mine did almost 95000

will this work ???

Brand: Lakewood Suspension
Product Line: Lakewood Performance U-Joints
Part Type: U-Joints
Part Number: LAK-23011
Solid: No
Greasable: Yes
Bearing Cap Style: 4 grooved
Bearing Cap Diameter (in) Axis 1: 1.125 in.
Width Including Clips (in) Axis 1: 2.556 in.
Bearing Cap Diameter (in) Axis 2: 1.125 in.
Width Including Clips (in) Axis 2: 2.556 in.
Universal Joint Material: Steel
Quantity: Sold individually.
Notes: Includes internal retaining clips only.

[LS2Tuner]

Mine did almost 95000

will this work ???

Brand: Lakewood Suspension
Product Line: Lakewood Performance U-Joints
Part Type: U-Joints
Part Number: LAK-23011
Solid: No
Greasable: Yes
Bearing Cap Style: 4 grooved
Bearing Cap Diameter (in) Axis 1: 1.125 in.
Width Including Clips (in) Axis 1: 2.556 in.
Bearing Cap Diameter (in) Axis 2: 1.125 in.
Width Including Clips (in) Axis 2: 2.556 in.
Universal Joint Material: Steel
Quantity: Sold individually.
Notes: Includes internal retaining clips only.

Save your money. Buy regular Spicer U-joint from Checkers. with a nice local warranty. That way if you have a problem you can run right down and swap it out. You won't ever put enough load on that joint to break it. You'll break a axle or carrier first.