blueblurZ28

I have a 2000 z28 M6. It has the stock 3.42's and i need to change them. I want to know what you recommend and for what reasons. I don't want 4.10's so it's between the 3.73's and the 3.90's. This is also my daily driver. Thanks

styoung

iTrader: (4)

i still say 4.11, i dd mine with a cam, all city driving and get 18 mpg, dont be scared go with the 4.11.

big reg

iTrader: (28)

I am in the same boat bud. Hopefully somone chimes in with what you asked for and not suggesting what you said you dont want.

LSGunZ28

iTrader: (8)

I went with 3.73s in my moser 12 bolt. I wish I went a little more agressive.

My car gets roughly the same mpg now, but I still notice the RPMs end a little lower. I wish I went with 4.10s.

However, since you dont want any, Id say 3.90s, because I didnt feel a big diff with the 3.73s, only thing I felt is my gears end quicker. But the car didnt feel faster, so might as well go numerically higher.

Oh and seriously, I know you dont want 4.10s, but DO IT!!! Because I did the same as you. people told me 4.10s, and Im like No thanks, Ill go 3.73s, and now I should have listend to them.

michaelg589

iTrader: (1)

Most of the guys that say 4.10s are also 1/8 mile racers. In a quarter mile, if you have a few bolt-on mods, youre gonna need to shift into 5th in the 1/4 mile (real race). with 4.10s in 4th gear, you can go a maximum speed of about 115mph. I dont know about anyone else, but i'm already hitting about 110 and I only have intake and catback. I went with 3.90s. They should be here today. I just gotta get them installed. Also, 4.10s will be a HAIR weaker.

stoverz28

iTrader: (8)

Why is it that you dont want 4.10's? Is it mpg? I get 22+ on the highway. If you are planning on staying N/A i would go w/ 4.10's no question, its just so easy n cheap for the gains you will receive. Almost half second in the 1/4 for under $400 in parts.

Braunbeck

iTrader: (4)

Crap, I was going with 4.10's but now I don't know. I don't want to run out of gear and be shifting into 5th by the end of the 1/4 mile.

Never really considered it until it was mentioned above.

Jon5212

iTrader: (2)

I've got 4:10's and i just averaged last week over 26MPG 60/40 Highway/City. Haven't seen the track yet though so I can't tell you on the shifting into 5th and the end of 1/4.

styoung

iTrader: (4)

true i didnt think of that, my shift light is set to 6800 rpms.

stoverz28

iTrader: (8)

If hitting 5th at the track is such a big deal, then just buy a set of taller tires. If you are so worried about what happens at the track then your gonna need a good drag tire anyway. Just my thoughts on it as i am more about the street.

02SOMWS6

iTrader: (6)

Wrong! In the 1/4 mile with 26" slicks I did not have to shift into 5th and I was trapping at 119-120 with the 4.10 gears . I have 4.30's and I just barley run out of gear with the 26" slicks and have plenty to go with the 28" slicks. A shift point change and a rev limiter change would cure that. The stock rears are junk so I think you should put the money that your planning on spending on the gears and install kit plus having someone do the swap towards a better rear with what ever gears you want. The stock rears are junk for a M6 , even on the street it will break. Spend it once and spend it right. 4.10's would be the only way to go if I didn't have my 4.30's
I know for a fact track proven that 4.10's are perfect for a M6 with or without spray with 26" slicks. I have been there and done that. go with the 4.10's

blueblurZ28

Thanks for everything guys. But yeah one of my main concerns was mpg. But if im going to get 18-22 i just might go with them. Any other comments or suggestions? Thanks

ShevrolayZ28

iTrader: (4)

Michael, most of this is just not true. In actuality, an M6 with 4.10 gear and a ~26" tire will reach ~121 MPH at 6500 RPM. Calculator: http://www.f-body.org/gears/

IMO 4.10 is a good gear choice for 1/4 mile racing in a ~3500 lb car with around 400-425 rwhp. A car with less power will be even farther from running out of gear.

To the thread starter. The best way to tell if a gear is right for you is to find a buddy with a car like yours, but with gears, and take it for a spin.

Don't fear the gear!

...sorry I had to say it.

jmdale1984

iTrader: (6)

I'm on my second gear swap... put 3.73's in the first time... decided to go with 3.90's this time.

michaelg589

iTrader: (1)

Ok well I was not taking into account a rev limiter change. the stock rev limiter is at 6200. I shift at 6000.

2000NavyZ

iTrader: (8)

go 3.90's and dont look back. i've driven 4.10 geard f-bodies and it made 1st gear end way to quick, IMO. 3.90s will have you in 4th gear at the end of the 1/4 mile unless you trap higher than 118...

02SOMWS6

iTrader: (6)

If 4.10 wind out to quick for you then you would hate the 4.30's that I have LOL

Silas2k

iTrader: (5)

ive never seen a bolt-on 4.10 manual car have to go to fifth in the quarter...

but if u still dont want it (u will probably regret it) but go with 3.90s i guess...

2000NavyZ

iTrader: (8)

idk, its not that i cant hit the gears fast enough that not made me like a 4.10. i love being in 2nd gear at 35ish for roll racing and for all around fun. i hit 112.93 on one of my passes with just headers and gears. the motor seemed to be buzzing quite high, id think with 4.10's the rev limiter would have been pretty damn close!!!

whitedevilWS6

iTrader: (10)

wow after reading all these sigs i realize how slow my car is. did y'all use slicks? did you just roll off the line or did you launch (or at least roll off the line very aggressively?) see i'm not sure why but i think it's because i'm just rolling off the line. i'm waaay too scared of breaking that 10 bolt so i'm really gentle on it (on street tires too). but more on topic, at 90 mph i'm turning 2k rpm with stock gears. multiply by 3 (6k rpm) and you get 270. everyone knows my car is not gonna go 270, so i wonder what the theoretical top speeds are with the different rearend ratios. and i'm still somewhat skeptical about mileage. i had an '01 camaro with a baby cam, heads, intake, and 4.10s and that thing seemed to go thru gas like it was cool. my 02 T/A is mostly stock and i usually get around 240-250 mi to the tank, and the camaro got like 150 to a tank!! same driving too. it is, however, possible that the custom gas tank on the camaro was pretty small, i'm not sure.