3.73 or 3.90 in my Z28 M6
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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
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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.
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.
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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.
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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.
Never really considered it until it was mentioned above.
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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.
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Originally Posted by michaelg589
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.
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Originally Posted by michaelg589
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.
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
Last edited by 02SOMWS6; 06-27-2007 at 05:45 PM.
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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
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Originally Posted by michaelg589
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.
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.
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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...
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Originally Posted by 2000NavyZ
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...
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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!!!
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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.