0rodney@rpmtransmissions

About an hour east of you in Gas City at Mike Anderson Chevrolet you can call Jay in parts, thats who I called and "check for yourself"

flyboy48

Thanks for the info Rodney. I worked GM parts for 9 years several years ago. I am retired now but occasionally work in the parts room at the local dealership to cover vacations, etc, dealer trades and such so I have access to the info anytime. Thanks again though for the info.

Tom

AirBusPilot

Facts? Oh crap man, why didn't you say so. Opinions are free here, but Facts require access to your Pay Pal account to be charged accordingly.

flyboy48

I will PM it to you. lol Just don't know who knows or thinks they know.

AirBusPilot

The GS hasn't been around long enough and produced in large enough numbers and even modified by a bunch of people yet to have a really good knowledge base of every nut and bolt.

Rodney at RPM is someone that appears to have first hand knowledge, and it's his specialty (trannys/diffs), so you can take his word. Hell, it's new to me too.

Bad News

Not to dig up an old thread but did anyone ever get to the bottom of this? Seems like Grand Sport has the same case as the Z06 but what about the internals?

camirocz

well put flyboy you are 100 percent right.

Bad News

I would take Rodney's word for it as RPM probably has more experience with diff's then anyone else but if you go back and read his post it says that the Grand Sport and the Z06 have the exact same case but did not comment on the internals. I also did a check on the part numbers and I didn't come up with the same thing. What makes the Z06 diff more expensive and desirable for high hp builds is its larger ring and pinion that also is shot peened from the factory. If you look at the price for an oem replacement ring and pinion for the Z06 and Grand Sport you will find that the Z06 ring and pinion is more expensive leading me to think that the Grand Sport does not have upgraded ring and pinion set. I am not saying anyone else is wrong here. Just looking at the numbers. This is an old thread so maybe Rodney will jump back in with his current experience.

C7/Z06 Man

SpinMonster

Thanks for taking the time to post. I recall you answering this question for me long ago.

Bad News

Ok so is everyone else reading something that I am not? As I go back and read Rodney's post once again it say that the "Case" is the same and in his research the "2011" Grand Sport and Z06 have the same replacement part numbers. Now I know there are a lot of intelligent people on this forum the have contributed a lot of good technical knowledge (Yes you Spin are included as you have helped me a lot in a past matter) but everyone knows that 2011 was not the first year for the Grand Sport and GM does have a habit of changing things from year to year on the same car. I am specifically asking about the 2010 Grand Sport diff compared to any other year Z06.

smonska

How do you tell a Z06 diff from a C6 diff externally?

I have a 2010 Manual Trans GS Coupe, if someone experienced could clue me in to the visual differences, I'd be happy to put it up on the lift and find out if it is a standard C6 diff case or Z06.

JCtx

I'm not sure how to interpret this, but the 'drain' plug (where the bottom cooling line attaches to) on the GS is 3/8". There's also a 1/2" one, but I don't know if it goes on the Z06 and ZR1, or just the latter. I know the Z06 has a 'beefier' rear end, but am also curious if just internally, or externally as well. I know only the ZR1 has beefier half-shafts, meaning it's possible the case on GS and Z06 is the same. Hope somebody knowledgeable answers your question .

FRANKIEC6

I jusr want to replace the ring and pinion in my 2010 GS trying to figure out the right one to buy