4.10 or 3.90?
Thread Starter
Instructor
Joined: Oct 2000
Posts: 179
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From: Philadelphia Pa.
4.10 or 3.90?
Guys, I have a mildly modified 6 speed and have decided to change the gears. I am leaning heavily towards the 4.10s. Is this too much? Or just right? My car is not a daily driver.
Thanks
Thanks
Melting Slicks
Joined: Oct 2002
Posts: 2,855
Likes: 0
Re: 4.10 or 3.90? (64FI)
How modified is your 6 speed, I am quite happy with the 390's but I was running quite a bit of power and with the stroker I wonder if I would have been better off with the 342's as far as track time goes, with 500 to 550rwhp I love the 390s and I'm sure I would love the 410s equally well there is a diff of 100 to 200 rpm at 80mph---if your car runs in the 120's in the 1/4 it could be the diff in an additional shift, based on the gear ratio's of a m6 at 6500rpm you would tech be maxed at 120mph, with the 390s at 126mph, something to think about---
Resident moron
Joined: Jun 2003
Posts: 4,746
Likes: 20
From: Assachusetts
Re: 4.10 or 3.90? (64FI)
Get 4.10s unless you are modified enough to need extra room in 4th for the drags. I am getting 3.90s because I run 122mph in the 1/4. With 4.10s that's basically on the rev limiter (6800rpm, I am actually going more like 125 when I let off). Leaves no room for improvement and also beats the **** out of the motor. With 3.90s, at 125mph I'm at like 6400-6500rpm, which is my normal shift point. Can do about 130 at redline (room for some new bolt-ons).
Dope
Dope
Drifting
Joined: Mar 2001
Posts: 1,471
Likes: 1
From: Pensacola FL
Re: 4.10 or 3.90? (64FI)
I just got my 4.10's in. Still in the break in period. It definitely is different. I would not worry about highway cruising in 6th- it's actually usuable now. 1st gear is very short now. We have an 1/8 mi track that I run ocassionally. My best mph so far is 88 in 3rd gear. The rpm is usually around 5700 at the traps. I am now worried I will run out of gear just before the traps. I raised my redline to 6400 with the hypertech. I don't think i'll hit the rev limiter, but I made my best ET's shifting right a 6000 rpm. I hope the car is not slower or that I have to shift to 4th right at the traps. The car is much easier to drive and you can be lazy letting the clutch out. I think launching at the track will be much easier, as long as traction is not a problem. I think either gear would be great. I wish I could try both and then make my decision. I am very happy with the 4.10's and i don't think you can go wrong with either one. SCOTT
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Burning Brakes
Joined: Apr 2002
Posts: 1,081
Likes: 0
From: Mississauga ONTARIO
Re: 4.10 or 3.90? (64FI)
Guys, I have a mildly modified 6 speed and have decided to change the gears. I am leaning heavily towards the 4.10s. Is this too much? Or just right? My car is not a daily driver.
Thanks
Thanks
there is a big difference with the M6 and the M12 (ZO6) tranny....
do u have an M6 or M12?
the stock ZO6 tranny and gear is equivalent to having 3.90 gears in a regular C5...
ideally, i would like to be able to finish the 1/4 in the top of 4th....
if i were to trap under 120 with the M6 3.42 setup, would 4.10s be the way to go?
Racer
Joined: Oct 2000
Posts: 319
Likes: 0
From: Frisco TX
Re: 4.10 or 3.90? (64FI)
My MN6 car is at 414 rwhp - really kicks in at 4000 rpms - Just got Gears put in and I LOVE the new found power - still in the break in period so I have not hit it real hard or high on the rpm's but the few "spirited" runs I have made me :D :D :D :D :D :D - I debated on 3.9's or 4.1s and my tuner recommended the 3.9s - so that is what I have - makes use of the power I have - doesn't really break loose too bad - can't image if I had 4.10's.
By the way with 3.90's your first gear max comes real quick!
Best of luck to you in your decision - you can't go wrong with either - but for what it is worth, now that I have driven the 3.9's if my car was only slightly mod'ed and was going to stay that way - I would go with the 4.10! JMHO :cheers:
By the way with 3.90's your first gear max comes real quick!
Best of luck to you in your decision - you can't go wrong with either - but for what it is worth, now that I have driven the 3.9's if my car was only slightly mod'ed and was going to stay that way - I would go with the 4.10! JMHO :cheers:
Burning Brakes
Joined: Jul 2003
Posts: 1,104
Likes: 0
From: "In a van down by the river" CO
Re: 4.10 or 3.90? (Z28Z28)
Similar question......99 hardtop w/ mild mods. H/C and No2 comming. No traction w/ stock rear end on bald run-flats. 3.90's or 4.10's? Thanks, Chris.
Racer
Joined: Jul 2003
Posts: 270
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From: granada hills california
Re: 4.10 or 3.90? (lowdowndirty)
I would go with the 410's with the m6 and 390's with the m12. I drove a m12 with 410's and to me there was to much wheel spin 1st and 2nd. I got 390's with the m12 best mod I have done so far.
Drifting
Joined: Aug 2003
Posts: 1,751
Likes: 3
From: Ventura, CA Fight On Forever
St. Jude Donor '03-'04-'05
Re: 4.10 or 3.90? (64FI)
Don't ask me, I'm struggling with 3.15 vs 3.42!
:lol: :confused: :lol: :confused: :lol: :confused: :lol:
Decided on the 3.42s :lolg:
:lol: :confused: :lol: :confused: :lol: :confused: :lol:
Decided on the 3.42s :lolg:
Team Owner
Joined: Apr 2001
Posts: 26,795
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From: Elmhurst, IL (West Suburb of Chicago) & Home of MEGA Horsepower
St. Jude Donor '06
Re: 4.10 or 3.90? (Andy@AandACorvette)
Definately 4.10. I sell those 3:1 over the 3.90. You'll never regret it.
I agree 1000%%%%! IN my lower gear tranny on 03 zo6 i live and swear by my 4.10s and would have it no other way.! :cool:
I agree 1000%%%%! IN my lower gear tranny on 03 zo6 i live and swear by my 4.10s and would have it no other way.! :cool: