4.10s - love at first drive
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Joined: May 2007
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From: Ocean County NJ
4.10s - love at first drive
Not yet enough miles on them but initial impression from just really wimpy driving is that I am going to love these things. 6th gear is a real gear now and since it moved the highway RPMs up, I am out of the drone zone - yee haw (the open side of the Z06 mufflers can drone like a SOB with my headers). At a four way stop near my home, I actually had no problem leaving in third gear (I did it by accident).
Why I waited so damned long, I'll never know.
Thanks ECS for doing some clean work - today was the gears, hardened output, rear brace, catch can and routine fluid changes. They did my cat back Z06 with NPP in a box and short throw shifter a while back which compliments the original bolts-on of two years ago - Kooks headers and cats, Callaway CAI, 160 degree thermo and tune.
Honorable mention to Spinmonster. After reading countless threads and posts about his opinions (ok - rants) regarding 4.10s, I took the plunge. Spin unknowingly planted the seed and Chris at ECS watered the ever loving pi$$ out of it. Thanks. This should hold me over into the winter when I will do H/C. Other bolts on have already been installed.
I simply can't wait till I get another 470 miles on these gears......
Why I waited so damned long, I'll never know.
Thanks ECS for doing some clean work - today was the gears, hardened output, rear brace, catch can and routine fluid changes. They did my cat back Z06 with NPP in a box and short throw shifter a while back which compliments the original bolts-on of two years ago - Kooks headers and cats, Callaway CAI, 160 degree thermo and tune.
Honorable mention to Spinmonster. After reading countless threads and posts about his opinions (ok - rants) regarding 4.10s, I took the plunge. Spin unknowingly planted the seed and Chris at ECS watered the ever loving pi$$ out of it. Thanks. This should hold me over into the winter when I will do H/C. Other bolts on have already been installed.
I simply can't wait till I get another 470 miles on these gears......
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From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
j/kEnjoy the mod.
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Joined: May 2007
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From: Ocean County NJ
If you have a Z51 transmission, try this link for the gearing difference:
http://xse.com/leres/bin/gearratio?t...rofile=&wheel=
The same link will lead you to the other transmissions as well. Play around with the calculator and you will see the interplay between tire, rear gear ratio, and transmission ratios.
I chose the 4.10 gears for general driving enjoyment and the occasional trip to E-Town. If I was going to road course track the car, I would have chosen 3.73s.
Whether you choose 3.90s or 4.10s, the difference is so slight that you can't lose either way. Remember 3.90s are 15% shorter than 3.42s and 4.10s are 20% than 3.42s. Where it really matters is at the 1/4 mile - if you intend to trap higher than 128 mph, choose 3.90s. Even though I may eventually trap higher, 1/4 mile times for me are not the end all, be all so I don't care all that much about the extra shift. I am fairly certain that I am going H/C in the winter (slight chance of FI) and if I trap higher, I'll grin (shift) and bear it.
Racer
Joined: Apr 2005
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From: Louisville Kentucky
I chose the 4.10 gears for general driving enjoyment and the occasional trip to E-Town. If I was going to road course track the car, I would have chosen 3.73s.
Last edited by VetteNo2; Jul 8, 2009 at 11:48 AM.
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From: Ocean County NJ
In the first three gears, a base transmission with 4.10s ends up having substantially similar ratios as a Z51 transmission with 3.90s.
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From: Paris IL
I have a Z51 H/C/I. I'm not too worried about mileage but do the 3.90s change it much? I like the idea of raising the cruising rpm a bit to help with the 55-60 mph drone, cause 65 is much better. I hope to get mine to open track next year and would have to check into the gears cost too.
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From: Ocean County NJ
I have a Z51 H/C/I. I'm not too worried about mileage but do the 3.90s change it much? I like the idea of raising the cruising rpm a bit to help with the 55-60 mph drone, cause 65 is much better. I hope to get mine to open track next year and would have to check into the gears cost too.
Z51 manual and 3.42 gears
Gear MPH @ 6500 RPM
1 50.9
2 73.1
3 105.8
4 151.2
5 213.0
6 265.3
Z51 Manual and 3.90 gears
Gear MPH @ 6500 RPM
1 44.7
2 64.1
3 92.7
4 132.6
5 186.8
6 232.7
Tech Contributor
Joined: Mar 2003
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From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
I have a Z51 H/C/I. I'm not too worried about mileage but do the 3.90s change it much? I like the idea of raising the cruising rpm a bit to help with the 55-60 mph drone, cause 65 is much better. I hope to get mine to open track next year and would have to check into the gears cost too.
I have 4.10's, H/C, S/C/nitrous, and its a Z51 and I observe an actual 30mpg (DIC says 32mpg). This was from checking gallons burned vs miles driven. As a H/C car it was about the same.
Floored in 4th gear on a dyno it reads 2mpg.
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From: Ocean County NJ
