huesmann

Not a Corvette owner (yet), but I went to look at a 2004 yesterday. Drove fine, but examining what I could of the undercarriage with the car on the ground, there was what appears to be an oil leak of some sort in the rear. There was black gunk (oil and the grit it picked up) on the bottom of the subframe, and a little bit on the exhaust bend that's right behind it. I couldn't get a look at how far forward the gunk went, but my initial thought would be that it was diff fluid, because it wasn't red like trans fluid. However, I could be wrong. Obviously I won't be buying until I can get a look under the car with the it off the ground.

Is this a common failure point at C5 transaxles, and what's the typical solution? Thanks!

zachaeous

Here is a link to a thread about diff leaking. This should give you a ideal of what you are looking for.
https://www.corvetteforum.com/forums...on-photos.html

Good luck with your purchase and this could give you some leverage in negotiating your final price.

bjones7131

May be the differential breather check valve stuck building up pressure and leaking out seal. Mine looked similar, I cleaned it up and fiddled with the check valve and no problem since then. Check valve is on top of rear end hard to get to and to even see. I have read that GM overfilled them origianlly as well. Good luck

bajapointe

How is the breather removed? Is it threaded into place or pressed?
I'm seeing the same problem with my 2001 with only 18K/miles on the clock.

bjones7131

Pressed in, has a spring and rubber washer and that is what gets stuck. Google c5 differential vent it will hit on forum and post even has a picture of the vent and how others have fixed theirs

huesmann

If it's pressed in, how do you remove it?

bjones7131

Do the search it shows what to do. It can b removed but it takes some effort. The post suggest popping top off of vent remove seal and spring and slip a piece of rubber hose over vent and put in a ball check valve on end of hose and attach it at a high level so no water can enter it. Again google it

bajapointe

I assume that this is it? I have it circled in green

bjones7131

That looks like it best i can tell

bajapointe

Anybody in Florida have a lift I can use? lol

pjazz

I took my 98 into the dealer because a small repair shop thought they saw fluid leaking from the rear. I have a manual trans. There were no spots in my garage.
Dealer said it was over flow. I hadn't changed the fluid in like 5 years so I had the fluid changed. Trans sounds and runs a lot better now. Imagine going to the dealer and not spending ton of cash.

bajapointe

Difficult to fathom,,,,