07IPCforMe

Ok, so I've read the flame wars on GS vs. Z06 and others that are mired between endless ad threads, so I am going to ask my own specific questions on this one.

Grand Sport vs. Base = wide body, tires/wheels, suspension, brakes, and axle ratio, right? The spec sheet from Chevy shows the specific axle ratio differences. Specifically/technically speaking, what is the difference in the

1. Brakes between the GS and Z06? (Chevy spec sheet reads exactly the same, "4-wheel ventilated, cross-drilled cast iron rotors with 6-piston front and 4-piston rear calipers" but then under the GS 1LT, the words change to, "Larger cross-drilled brake rotors with 6-piston front and 4-piston rear calipers (Grand Sport))

2. Suspension between Base, GS, and Z06?

Now, specifically to the GS. VIN slot #5 is said to be a P for a "base GS" and a U for a 1LT GS.

I was not aware there was something "under"(?) a 1LT, which is what I thought I bought...but my VIN has a P...so, what's up with that? Does the 1LT have larger brakes than a base GS? Is there such a thing as a base GS without 1LT and what is the difference? Why is there a P and a U in the VIN list? WTH?!?!?

Corvette Junkie

From what I see in the Corvette Black Book P = GS 1LT with a manual transmission U = GS 1LT with an automatic transmission.

07IPCforMe

Ahh...thank you for that. Another point of interest is that even though it's a '13 GS MT, the sticker still shows Mexico as the engine mfg point of origin vs. the Wixom hand-built plant.

Thanks again, one question answered!

sevinn

Is it a coupe or a convertible? Only manual GS coupes end up with the wixom built motor.

unixcorn

The hand-built engines are dry sump. If yours has the dry sump, see if it's signed.

http://forums.corvetteforum.com/c6-c...mp-engine.html

07IPCforMe

It is, and Mr. Ronald Lucas built it. Thanks for that thread link!

EvanZR1

Wheels: same size as Z06, but different design.
Tires: same as Z06.
Brakes: same as Z06.
Suspension: Similar to Z06, but revised specifically for GS. Several car mag reviews state the GS is actually more confidence inspiring on track vs. the Z06. Available with MRC starting in 2011 (included Gen 2 Goodyear Supercar tires, which are significantly better than regular GY Supercars). MRC on the GS is in addition to the already upgraded suspension, and is not the base F55 suspension (in effect it's similar to the MRC on ZR1).
Body: same as Z06, but all SMC (no CF).
Manual trans: TR6060 but with Z06 30 spline main shaft and lower gearing (Z51 ratios).
Differential: same as Z06 (includes cooler).
Engine: Hand built dry sump LS3 (only with manual trans) with oil cooler.
Weight: Approximately 100lbs more than Z06 (no aluminum frame)

need-for-speed

Axle ratio: No. All manual tranny C6's have 3.42 axle ratios.

A6 folks can chime in but I believe they are all 2.56 with optional 2.73

I think you meant to say different gear ratios in the manual tranny

Purdue

You're correct.

2005 A4 (2.73 or opt 3.15 perf axle)
2006-2007 A6 (2.56)
2008-2009 A6 (2.56 or opt 2.73 perf axle)
2010-13 A6 (2.56 Coupe/Vert and 2.73 GS Coupe/GS Vert)

Cyber Greg

Throw some Michelin Pilot Super Sports on your GS with MRC suspension and the thing handles GREAT. I've had a lot of car aficionados drive my car blown away by how well it handles.

Dallasb84

Z06 should have different valving in the shocks.

Rebel 1

LINK to GS manual trans "Z06 30 spline main shaft"?

The TR6060 MM6 used in the Standard Corvette and Z06 Used the 30-spline Output Shaft and the Stronger Single-Piece Countershaft.

Think the TR6060 MZ6 used in the Grand Sport and Corvettes with Z51 package used the 27-spline output shaft and two-piece Countershaft.

http://view.officeapps.live.com/op/v..._MG9_M10_n.doc
http://view.officeapps.live.com/op/v...2520manual.doc