We back to Mike & Ron at Vengeance Racing in Cumming Georgia to have gears installed. Went with the RPM stage 2 set up and all I can say is WOW, what a difference. Thanks for a painless and professional experience and for having the work done on time. Its like getting and extra gear. Gotta watch that shift light now!!! Thanks again, Bob(VNVETT)

 

You put 3.90's in your 04Z? I have a base 08 and like the 390's.
But I also had a 02Z. Never felt the need for gears with it, As they
have like the C-6 Z-51 a lower 1st, 2nd, and 3rd!

 

3.90s are the BEST

08 LS3 Z51 6sp MANual

 

Sorry, I long forgot to change my profile. I sold the Z and got an 07 Coupe with Z-51 options 2 years ago. I installed headers , borla exhaust , Halltech intake and Vengeance Comp Cam..VRX-5 and the 3.90 gears.

 

Joe_G and I are both running 3.90 gears in our C6 verts, and are GREAT enthusiasts for the ratio.

 

390's here, 07 m6 h/c, great mod.

 

ive been looking into doing this as well what is a typical install price to have them installed i know parts are around 400. I seen on east coast superchargings website that installed is 1350 or something along those lines. Ive had gears installed on other car before and never payed close to that for install is the corvette install differnt for some reason?

 

My tuner explained that a mustang rear is just a matter of taking off the back cover, change gears and replace the cover. A corvette rear ends housing is presses together, requiring the complete removal from the car. A special press is use to pry it open, then the gear swap, then press back together and reinstall. Obviously one of the axels has to be dropped in order to get the housing out. This is why $1300-$1500 is a common pricetag.

 

I just had my 3.90's installed 2 weeks ago. I went with hardened output shaft and had the gears cryo treated. It was about $1900. I have not gotten on it very hard yet due to the break-in, but I certainly can tell the difference. 6th gear is actually usable now.

 

Amen, Love the new gears...Night & day

 

I agree unless you want to be fast then you get 4.10's.

Actually, 3.90's represent a safe option for today's cars in that they allow the natural progression to modding that allows a higher than 128 trap speed. Our cars are so easy to mod for faster than 10.5 1/4 mile performance and it makes sense to then have a gear set that isnt limiting the trap speed.

I was dead set against supercharging until moving to 6800 feet elevation caused me to have to get FI to get air in my engine. Here 800rwhp is like 700rwhp at sea level and it will run faster than 10.5's. Today's tire options also allow you to hook with insane power levels.

Thanks to A&A and the ECS s/c systems, getting real speed/power is as reliable as a H/C car.

I have been working with a tuner in the denver area. We are developing and tuning an E85 twin turbo car that uses 96 pound injectors and uses a crazy fuel system that can support up to 2000HP. This car will end up in the 1000HP range and it doesnt matter what gear you are in nor does it matter what rear diff ratio you use to be fast. My car is slow in comparison. Driving it was unlike anything I have ever been in. Gears make no difference at that power level. The car is running Hoosier R6's all around and stick the ground no matter what you ask the car to do. Boost is addictive.

 

My first set of 390s went bad at around 500 miles (and it seems I'm not alone). My installer blamed the gears; supposedly all the taller gears for the Corvettes are manufactred by a company in Italy, and they've been having problems. I just got my car back after having the second set installed and am holding my breath during the break in period (one of our forum members just informed me that his second set is now humming after six hundred miles). Crazy stuff to say the least.

 

geez that doesnt look to promising thanks for the heads up

 

I had 2 sets of 410's go bad. 500 miles and 70 miles. Didn't even make it home on the second set. Installer called me and said the new set of 410's didn't look very good???????? Said he had a set of 390's that did look good, so I went with them. So far 5,000 miles and they are ok but I really haven't hammered it too much. I don't know if it's the gears or the installer.

 

wow sounds like the failure rate it just about as high if not higher then the rate of properly functioning ; maybe an installer will chime in here as to wear its an issue of quality of gears or install mistake. If issue with gear quality you would think another company would go ahead and make a set

 

I'm leaning toward the installers, from what I've heard, installing Corvette gears is a real art and not everone can do them. Mustang gears are easy compared to ours. Like you said, maybe an installer will chime in and shed some insight.

 

Seems like a good idea to chime in on this small piece of advice....source the diff and the install work from one and the same tuner. If the gear set is bad the installer will want to charge labor since its not his gear set. It will also lay up your car on a lift waiting for the guy you did source the diff from to get a new one to you....also not free.

If the gears are bad and the installer did the labor in addition to sourcing the diff, he must make good on the labor to fix it. The one mod you better do this with is the clutch.

 

Yeah, just ask Cameron..

 

Spin:

Are you suggesting that you should do gears while doing the clutch OR if you do gears, get a new clutch? Reason I ask - I am doing 4.10 gears in the next week or two.

Thanks

 

I began to think my installer might be at fault with the gear install, but then I began researching and discovered that many members throughout the country are running into this problem, and their installers have been confiming the story about the Italian gear manufacturer.

I also can't understand why no American firms are making gears. If I owned a factory, I'd be looking to jump all over this opportunity. Go figure.