ascastil

Looking at buying one but its not in the car. How can I tell if its a Z06 diff and Im not getting hosed? Any way to tell what gears are in it without build codes?

neutron82

you can count the splines in the pinion, it should have 30... as far as I know the only gear available for the z06 is a 3.42

SBCGENII

SBCGENII

Use google image search to look for pics of the diffs. Will be easy to tell if you are looking at a C5 diff or a c6z diff.

neutron82

all of the c6 diff cases except for the zr1 look pretty similar, I'm not sure how to tell those apart just by looking at them

RpeterK

The bolt circle for the side covers are different on the Z06 to accept the larger ring gear. Not the bolt location within the circle but the diameter of the circle its self. The P/S cover is about 13/16" larger in diameter.

bob

ascastil

Do you know what the size is for the non z06 then so I can measure?

CamminC5

The covers are the same size on base c6.

The difference is very noticeable.

If you have to change the o-ring on a C6Z diff they are different sizes. Unlike on base c6 and c5 diffs which use the same size o-ring.

ascastil

So the circles are different sizes on either side of the diff?

If they are the same size on both sides its a base C6?
If they are different sizes on both sides its a Z06?

CamminC5

That's a Z diff. But it's really cheap. You can see the passenger side is larger than the driver in the 3rd pic.

ascastil

Just went and looked at it. It's legit. Going back with a truck later. Cant believe it. Teeth looked good too. He wrecked his Z06.

CamminC5

Your lucky man. That's an awesome deal. I paid 1400 for mine and knew it had to be rebuilt. Must not know what he has or just doesn't care.

neutron82

real good deal especially if the suspension stuff came with it, you could sell that off and make most of your money back and put that towards building the diff up

ascastil

Im totally stoked you guys! I can run some slicks now. I wasnt even getting excited on the way over there in case it was a base model rear. This is karma for all the car parts Ive sold for dirt cheap on CL over the years, it finally paid off.

RpeterK

Yes This is correct.

Sorry been busy working in the shop.

neutron82

do you have a trans to mate with the c6z diff?

ascastil

Thought my T56 would mate up to it with some spacer or something?

ascastil

Its at home. I feel lucky finding it. $700.

neutron82

if you have a stock c5 trans those are 27 spline and as far as I know all the c6z/zr1/6spd grand sport have 30 spline pinions in the diff... so either you need a 30 spline 6060 trans or I believe rpm can respline the pinion to fit your 27 spline trans and you would need to find a way to bolt them together... c5's use 5 bolts and the c6z diff uses 8... maybe they have an adapter or you could use a tailshaft housing from a 6060, I really don't know the amswer to that

CamminC5

The 6060 uses larger bearings and races. So the 6060 tail is out of the equation (unless you modify one to accept the smaller race).

I have went from tr6060 to a c5 diff, but not the other way. Call Jeremy at RPM tomorrow and ask.

Your best bet would be to find tr6060. Make sure it's 30 spline.

Unless you plan on keeping the oil cooler in the back of the diff you will need to get a C5 rear cover.

The C5 exhaust needs to modified to clear the mounts on the diff. This involves removing approx. 3" of straight section from the X-Pipe and relocating it to the hump section.

Also going to need offset diff mounts to keep everything lined up properly.

As far as building it up. Add RPM's clutch pack and DSS out put shafts. That's all it needs.