supervette26

Hey all,

I'm a newbie and wanted to know what 4.10 gears is...

Thanks

Firedog

It means that for every revolution of the wheels, the driveshaft must rotate 4.1 times...

supervette26

Can you further explain this..... I have no idea what that means.....

C6NRED

The higher the number for your rear end gears, the faster the engine must turn for a given speed........you will be able to accelerate much faster to that speed because the torque of the engine is able to 'push' against the gears more easily, but you will lose top speed as the engine will run out of RPM......with stock gearing the C6 is capable of somewhere around 190 MPH, and can go 0 to 60 in 4.2 seconds. With 4.10's, I'll bet that top speed is going to be down to 150- 160, but you will be able to go 0 to 60 in probably 3.8 seconds.........better learn how to shift like lightning too, as it will now require a 1-2 shift!!!
At 80 mph, you are also going to be turning MANY more RPM's than you were before in top gear, and your MPG will be that much worse too.

johnodrake

In order to move the mass of the car with the HP available in an appropriate amount of time, there needs to be a reduction gear between the engine and the wheels to multiply the engine torque.

The transmission supplies some of the reduction gearing (and in the case of our cars, some over driving as well).

The closer to 1:1 the gearing overall, the less the torque multiplication.

Standard gearing in a Corvette with manual gears is 3.42:1 (3.42 revolutions of the drive shaft to 1 revolution of the rear axle (wheel).

Some folks, Like me want to have greater torque multiplication so we can get to speed more quickly. We therefore install a different gearset in the differential - e.g., a 4.10:1 ratio (some use 3.73 and others use a 3.90). The ratio is determined by the number of teeth on the pinion gear (the gear from the drive shaft) and the ring gear (the gear attached to the wheels) (There are many other factors but that is the basic)

Since the rule of "there ain't no free lunch" applies there is a cost. The gain is quickness to speed and the cost is lower fuel economy. The fuel economy suffers some because for any given speed over the road in any given transmission gear, with a higher (numeric) ratio, the engine is turning more rpm. In my case I lost about 2.5 mpg at cruise in 6th gear.

james1990

sryy noob here too :o
with 4.10s the top speed will be 150 mph? thats pretty extreme

0-60 in 3.8 is looking so nice tho
good luck keeping the tiers on the ground tho

johnodrake

Nope. You will get top speed in 6th vice 5th. Many 190+ owners with 4.10s. Don't take my word for it - do a search.

Silverspeed

Hasn't it always? Only the Z06 will hit 60 in first.

C6NRED

You could be right, but now its too late to edit my post!!! And if you can pull 6th instead of 5th to top speed with the 4.10's my original estimate of top speed is probably too low as well............BUT, at least I was right about the RPM's on the highway and the reduced MPG, right? I mean RIGHT?????

Silverspeed

OK, OK, I'll give you that!

C6NRED

Thanks, silverspeed, I'm breathing again!!! That is only the 8th or 9th time I've been wrong today, and I was SO hoping to leave work with my errors in single digits!!!! (and yes, I did forget that the top speed with the 6M is reached in 5th....)

avizandum

The 4.10 gears, or whatever ratio, is the ring and pinion set in the differential housing. The "pumpkin" you see from behing RWD cars that the axle shafts come out of.

Gordon Shumway

Oh yeah...You were right. I have 2007 TB SS with the LS2 engine and 4.10 gears. On the highway at 75MPH it is about 2400-2500 RPM's and the gas mileage is atrocious. But it sure will get my boat up a steep ramp..

supervette26

so how do I change to a 4.10 gear

FordDefector

If you have to ask then you should definitely have them installed by a competent shop because if you don't install right and set the lash properly they will fail in a hurry.

supervette26

What do I need to buy to do this???

andympd

One of the best mods I've done. You can call chuck of westchester and he can advise further on the details and where you can have one installed near you.

johnodrake

Go talk to he good folks at LAPD (Forum Vendor). Ask them to put in a DTE 4.10 gearset

supervette26

how much does it usually cost???

C6NRED

Plan on spending $1600 to $2100 for the new differential and another $800 to $1000 for installation......go with the hardened output shafts too......