bonnell

Hi Everyone,

I normally post on the C4 & C5 forums because I have both. I will be selling my C4 soon and I have been considering adding a C6. I will not do this until next year but next year will be here soon and I want to learn as much as I can about the C6 before I buy one.

What is the standard axle ratio on the C6? My '02 C5 is an A4 with the standard 2.73 axle. I intend to get a C6 with an MN6 and at least 3.42 rear axle. Are there performance packages that I should look for like the Z51? What else?

Thanks for your input.

J

Patman

The standard axle ratio is 3.42 with the manuals and 2.56 with the automatics. In 08 there is an optional 2.73 ratio for the automatics.

bonnell

Thanks Patman. Another C5 guy!

hawkeyefan

So, will you go with a 2.56 axle or the 2.73? I was thinking about buying the same option (2.73 axle). This will be my first corvette and any guidance you can provide would be great.

Patman

The original poster said he was going for a manual, so he has no choice in the axle ratio, it'll be 3.42

jschindler

True, but the ratios in the transmissions are different. The manual in the Z51 has lower ratios in every gear except 4th.

bonnell

This is the kind of info that I need. My '02 convertible has the standard 2.73 gears and teh A4 transmission. I understand that going to 3.42 gears makes a huge difference.

I do intend to get the 6-speed and the intent is to get the most noticable seat of the pants feel during acceleration.

Eventually whether I buy new or used the idea is to use this one for a weekend driver and I intend to add a supercharger.

shopdog

That was the case with the T56 transmission. The 2008 comes with the T6060. I haven't seen official word about the gear ratios in the T6060.

shopdog

Do realize that the current C6 offers a 6 speed automatic. So both manual and auto are 6 speeds. The auto has a much lower low gear too. When you add in the optional 2.73 rear, it is like a manual with 4.10 rear gears. There are finally high stall torque converters and tuning available for the A6, which should make it a killer for the drag strip, or the stop light grand prix. The new A6 is proving to be stout, able to handle the torque of supercharged cars. OTOH, the manual boys are having clutch woes.

Patman

I think an 08 with the optional 2.73 ratio, along with a higher stall convertor (maybe 3500-4000 rpm) and super sticky tires (DOT cheaters or slicks) could easily run mid 11s all day long. Someone on here needs to try that and prove me right! (Larry my fellow LS1Tech moderator, are you listening?)

8850

I'm listening! And you are absolutely right. Once a Yank or PI converter comes out for my A6, bye bye 6Ms. Manuals don't have a chance against the an auto with the right sized converter.

And probably won't even need the 2.73. My 2.56 will do just fine with this 4.02 first gear and a loose converter.

Patman

Are you still considering getting an 08? I'm trying my hardest to talk you into it, since I can't afford one I want to live vicariously through you!

8850

Patman, I'll probably get an 08 but for now not sure until I've seen one and do a little more homework. Hate to buy anything without checking it out first. Like that new exhaust. How sensitive it will be to opening, how loud. I don't want something that is going to be noisy at 75 mph cruising. I've never heard a Z06 but I've heard it's virtually the same. Does a Z06 open early and at how much throttle?

I really like the idea of a 2.73. My 6th gear is not very responsive. A slightly lower gear should help. Driving in 5th I only lose 2 mpg. That 2.73 may even help mileage as well as acceleration the way the car feels over geared.