3.90 or 4.10
Go big or don't go...
Joined: May 2005
Posts: 1,569
Likes: 1
From: Georgetown TX
Originally Posted by rgcarmack14
I have an '06 MN6 F55 coupe which has 3.42 gears. Sixth gear is totally useless so hopefully that will change with the 4.10 that DTE is installing this week. Also, one of the first mods I got was a B&M precision short shifter which I love. 
Robin
Robin
That's a sweet combo, color and performance. I've always wondered what the F55 would be like with the T1 or Z51 sway bars and some 2-piece slotted rotors. Now with that 4.10; you'll have some snap in your step!! Best part about gears is that they are hard to spot by the dealership!! So you've got a good setup there!!
JK
Melting Slicks
Joined: Nov 2002
Posts: 3,398
Likes: 2
From: Allentown PA
Originally Posted by jkonkle
I'm suprised you are having it trailored to DTE. If you don't mind me asking, where do you live or how many miles away. Have you thought about driving in?
That's a sweet combo, color and performance. I've always wondered what the F55 would be like with the T1 or Z51 sway bars and some 2-piece slotted rotors. Now with that 4.10; you'll have some snap in your step!! Best part about gears is that they are hard to spot by the dealership!! So you've got a good setup there!!
JK
That's a sweet combo, color and performance. I've always wondered what the F55 would be like with the T1 or Z51 sway bars and some 2-piece slotted rotors. Now with that 4.10; you'll have some snap in your step!! Best part about gears is that they are hard to spot by the dealership!! So you've got a good setup there!!
JK
Originally Posted by rgcarmack14
It is own its way to DTE right now for the Stage 2 package. Getting the differential out wasn't as bad as expected. It took my buddy, who owns a transmission shop here, about 2 hours to get it out but he has a lift which makes life so much easier when doing things like that.
Robin
Robin
Go big or don't go...
Joined: May 2005
Posts: 1,569
Likes: 1
From: Georgetown TX
Originally Posted by CYA-Vett
You might want to read the entire thread...
:o
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Originally Posted by own2vettes
Why not just leave it stock if you're not going to race?
Leave it stock.
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,939
Likes: 0
From: North Carolina
Originally Posted by own2vettes
Why not just leave it stock if you're not going to race?
Because I hate the 3.42 gearing and I just enjoy spirited driving. Racing, in my opinion, has nothing to do with enjoying driving the car and experiencing the torque that these cars offer. \
Robin
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Originally Posted by Fore58
After talking to some of the guys about gears, 3.90 is the way to go. Only drawback on the 4.10 is that you may have to shift much sooner.
Le Mans Master
Joined: Oct 2005
Posts: 5,053
Likes: 889
From: Tampa Florida
Originally Posted by SpinMonster
Increasing hp makes you shift sooner so dont do that either.
So, what would you do first, headers w/CAI or just 3.90/4.10? Though, the gears would cost a little more.
Instructor
Joined: Jun 2006
Posts: 172
Likes: 0
From: Seattle WA
I've got 3.9s in my 05 Z51...
At the 6500 redline here's where I top out in 1 through 4:
1: 43
2: 62
3: 90
4: 128
First and second go by so quick it's hard to imagine them being any faster without wondering if the frequency of shifts is hurting your time for straight line acceleration. Third gear is where the real fun is at with plenty of torque between the reasonably streetable speeds of 45 and 90. Fourth pulls well all the way to 130+. By the book it should be only 128ish at 6500, but I've seen 135 before it cut off.
My car is cammed to about 500hp so my minimum crusing RPM is a bit higher than normal, but this works out well since 6th runs slightly higher RPMs now.
0-100 in my current configuration is in the low 8 second range.
In my experience the 3.9s are a good fit for my car and driving needs, but I think it really depends on what you intend to use it for. If anything, at least you'll be getting something that's stronger than the stock diff. Good luck.
1: 43
2: 62
3: 90
4: 128
First and second go by so quick it's hard to imagine them being any faster without wondering if the frequency of shifts is hurting your time for straight line acceleration. Third gear is where the real fun is at with plenty of torque between the reasonably streetable speeds of 45 and 90. Fourth pulls well all the way to 130+. By the book it should be only 128ish at 6500, but I've seen 135 before it cut off.
My car is cammed to about 500hp so my minimum crusing RPM is a bit higher than normal, but this works out well since 6th runs slightly higher RPMs now.
0-100 in my current configuration is in the low 8 second range.
In my experience the 3.9s are a good fit for my car and driving needs, but I think it really depends on what you intend to use it for. If anything, at least you'll be getting something that's stronger than the stock diff. Good luck.
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,939
Likes: 0
From: North Carolina
Originally Posted by gath47
At the 6500 redline here's where I top out in 1 through 4:
1: 43
2: 62
3: 90
4: 128
First and second go by so quick it's hard to imagine them being any faster without wondering if the frequency of shifts is hurting your time for straight line acceleration. Third gear is where the real fun is at with plenty of torque between the reasonably streetable speeds of 45 and 90. Fourth pulls well all the way to 130+. By the book it should be only 128ish at 6500, but I've seen 135 before it cut off.
My car is cammed to about 500hp so my minimum crusing RPM is a bit higher than normal, but this works out well since 6th runs slightly higher RPMs now.
0-100 in my current configuration is in the low 8 second range.
In my experience the 3.9s are a good fit for my car and driving needs, but I think it really depends on what you intend to use it for. If anything, at least you'll be getting something that's stronger than the stock diff. Good luck.
1: 43
2: 62
3: 90
4: 128
First and second go by so quick it's hard to imagine them being any faster without wondering if the frequency of shifts is hurting your time for straight line acceleration. Third gear is where the real fun is at with plenty of torque between the reasonably streetable speeds of 45 and 90. Fourth pulls well all the way to 130+. By the book it should be only 128ish at 6500, but I've seen 135 before it cut off.
My car is cammed to about 500hp so my minimum crusing RPM is a bit higher than normal, but this works out well since 6th runs slightly higher RPMs now.
0-100 in my current configuration is in the low 8 second range.
In my experience the 3.9s are a good fit for my car and driving needs, but I think it really depends on what you intend to use it for. If anything, at least you'll be getting something that's stronger than the stock diff. Good luck.
Thanks! I really am excited about the difference in the response of the car. My car is cammed as well so can you tell me what your RPMs are in 6th gear cruising around, say, 70 mph?
Robin
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,939
Likes: 0
From: North Carolina
Originally Posted by gath47
I went for a drive this morning and 70mph crusing was just under 2000 rpms.
I am curious what the specs of your cam are. Mine are 228/228 115lsa. Thanks.
Robin
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by HITMAN99
Neither. 3.73:1 is the perfect gear, especially for an LS2.
Race Director
Joined: Apr 1999
Posts: 12,735
Likes: 28
From: Kayenta Utah
Originally Posted by rgcarmack14
I have an '06 MN6 F55 coupe which has 3.42 gears. Sixth gear is totally useless so hopefully that will change with the 4.10 that DTE is installing this week. Also, one of the first mods I got was a B&M precision short shifter which I love.
Robin
Robin
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,939
Likes: 0
From: North Carolina
Originally Posted by Paul Scarpelli
6th gear, by the way, is strictly for low revs and high gas mileage when cruising. A useless 6th gear...by the way...is one where you are in 6th gear on the interstate pulling 2400 rpm at only 80 miles an hour, getting 24 mpg instead of 29. If you need some punch, just downshift. That's why you bought a manual transmission. Or maybe not.
I came from a 3.73 gearing so the 3.42 is a joke. I have downshifted and it is still pretty pitiful in my opinion.
Robin
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Originally Posted by Fore58
SpinMonster,
So, what would you do first, headers w/CAI or just 3.90/4.10? Though, the gears would cost a little more.
So, what would you do first, headers w/CAI or just 3.90/4.10? Though, the gears would cost a little more.
Originally Posted by gath47
At the 6500 redline here's where I top out in 1 through 4:
1: 43
2: 62
3: 90
4: 128
1: 43
2: 62
3: 90
4: 128
Race Director
Joined: Oct 2004
Posts: 10,516
Likes: 2
From: Virginia Bch VA
Cruise-In VI Veteran
Cruise-In VII Veteran
St. Jude Donor '06
Originally Posted by CYA-Vett
4.10's without a doubt if its for the street. If you plan to mod and race then it will depend on HP/Trap speeds.
They both cost the same, go with the 4.10's and don't look back. Have them slip in a hardened output shaft too
They both cost the same, go with the 4.10's and don't look back. Have them slip in a hardened output shaft too
The shaft will be your weak link with the mods U already have. A cheap insurance policy
Safety Car
Joined: Jun 2005
Posts: 4,905
Likes: 569
From: Bucks County PA
Great Topic:
I have the LOWLY Base mn6
It was brought to my attention that adding 3.90s would make my car equivalent to a Z51 manual tranny in gears 1-3, but after that it would be much lower geared with the 3.90s.
As far as spirited driving, I have owned many BEASTS and I think the BASE C6 MN6 has plenty of GRUNT.
I'd hate to change gears and alter the way Chevy has balanced this car.
I think the Z51 manual is geared very well for stock and lightly modded cars and even for highly modded cars with stock 3.42 gears.
I think the BASE manual would be better once you crank up the power with a Supercharger or heads and a cam. The lack of torque multiplication with the taller tranny gearing would prove to be an asset in the traction department for those who track their cars and even for spirited driving.
So, for me I am sticking with my stock 3.42s, heck my Viper only had 3.07s and it pulled like nothing else I have ever driven.
JMHO,
Howard
I have the LOWLY Base mn6
It was brought to my attention that adding 3.90s would make my car equivalent to a Z51 manual tranny in gears 1-3, but after that it would be much lower geared with the 3.90s.
As far as spirited driving, I have owned many BEASTS and I think the BASE C6 MN6 has plenty of GRUNT.
I'd hate to change gears and alter the way Chevy has balanced this car.
I think the Z51 manual is geared very well for stock and lightly modded cars and even for highly modded cars with stock 3.42 gears.
I think the BASE manual would be better once you crank up the power with a Supercharger or heads and a cam. The lack of torque multiplication with the taller tranny gearing would prove to be an asset in the traction department for those who track their cars and even for spirited driving.
So, for me I am sticking with my stock 3.42s, heck my Viper only had 3.07s and it pulled like nothing else I have ever driven.
JMHO,
Howard