99midnightZ

i was just wanting some opinions on the best gear ratio for auto

GreekGator

i drive a 6-speed, but from what i've heard, 3:73 is the optimal choice for the auto. If you already have 3:23's, id just leave those and go with an aftermarket converter. just my .02. hth

Smokinstorm

iTrader: (5)

After much thought I finally settled on 3.90's for my 2000 SS A4 with a PT4000 converter and a Moser 12 bolt. I had been going back and forth between the 3.73's and the 4.10's when I got my new Summit catalog and right there in the Richmond 12 bolt car rear gear section was a 3.90 offering. I ordered it today. I'm more interested in track performance than highway driving, hence my decision. The reason I didn't go with 4.10's is that I'm getting ready to install another engine and expect trap speeds in the 130 range so I'd run out with the 4.10's. The 3.90's should be perfect for a lot of people that have been trying to decide between the performance of the 4.10's and the relative streetability of the 3.73's. Just my opinion of course.

CRAGER

3.23 or 3.42's for a street car, and 3.73+ for a car that will see the track often. IMHO


Peace,
Craig.

taintedmeat

iTrader: (1)

I'm getting mine back today with 3.73's in it.

mikemodano9c

set long term goals for your car...if your staying with a 4l60e then see what gears you can use and still cross the traps in 3rd gear at your given rpm

im running 3.42's and 3rd gear at ~6700 rpm is about 130-135, which is perfect for me after i put the bottle back on the car...

if you are running n/a and aren't planning on a power adder 3.73's are pretty nice, but it will cost you more in gas mileage...

3.42's are a very nice gear with a 4l60e

Blacker

iTrader: (3)

I had 3.42's and they are a nice all around gear. I have since upgraded to 3.73's are they are better. If you ever upgrade the torque converter then, gear selection will be important.

Speed Density

iTrader: (38)

4.10 are nice, but your trap speed will be low!!!! 90+ havent hit a 100

RollinSScamaro

iTrader: (25)

I have 3.70's in my 9"! i like them! at the track i passed through the traps before shifting.. can't remember what RPM though.. but i was shifting at 6400 down the track!

3.23 and 3.42 are too small IMO! 3.70 or 3.73 is perfect for street and strip!

I daily drive my car a lot too! fuel mileage isnt the best but its still pretty good for a H/C bolt on car!

Urban Legend

iTrader: (5)

3.73 here.

ULTIMATEORANGESS

iTrader: (4)

3.73s.


not a big ET gain with them but much better response at hwy speeds.

1999Z28

just put 4.10s in it...we'll see how the track likes them though. The street really doensn't like my tires. shift points are about 28, 65, 110 through the gears.

Spooln

3.23s work really good for a street driver. At the track i wouldn't go any lower then a 3.42.

Mike2000Z28

Getting 3.73s in my Z this week. Should be some ordering new tires next week.

Ouija

iTrader: (3)

I did 3.42's and they are nice. Car is a daily driver, with occasional track use. Unless it's a weekend warrior I wouldn't go higher.

josh99ta

iTrader: (1)

3.42s are a good street/strip gear. Best all around gear IMO. Not worth swapping to if you already have 3.23s though. If you're going for max ET and want some streetability, 3.73s. If you're ready to burn some gas and get the max at the track 4.10s.

CrawlinWS6

iTrader: (41)

when i ordered my 12-bolt I got the 3.73, think its the best way to go, at 70mph your rpm will be at 2400rpms.

THE LAST Z

iTrader: (5)

I say if you dont spend much time over 160 MPH, go with the 3.73's.

This car has 3.73's (or had-i think tbyrne parted this car out)

http://www.tbyrne.com/projectls1_files/tbyrne2.mpg