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Old 09-28-2015, 08:56 AM   #1
 
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Default C6 Differential R&R

So I went to the track Friday night, and after my last pass when I went to jack the car up, there was gear oil all over the diff, mufflers and was dripping on the ground.

Drove the car home, no loud or odd noises from the diff at all. After talking with STG Motorsports we think it is one of two things...

1. The diff burped and puked fluid out the breather on top of the diff and sprayed it everywhere.

2. The case is cracked.

I'm going to attempt to do a removal, inspection and re-installation in my garage in Carol Stream this week.

I understand that my day job is not a mechanic, but I'd say I'm decently mechanically inclined. This will be one of the biggest jobs I have attempted in the garage and I was looking to see if anyone was willing to lend a helping hand.

If you come over I'll make sure I have cold beer and food. I'm thinking about starting to tackle this tomorrow night (Tuesday).
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Old 09-28-2015, 08:57 AM   #2
 
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@utryd2. He's an expert at removing any Corvette part.
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Old 09-28-2015, 09:02 AM   #3
 
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Check axle seals. Fairly common on c6 to leak/fail. Also make sure axles are pushed all the way in to the case.

If you cracked the case more than likely you would have broke the internals.

Highly doubt you burped that much fluid to cover all the parts listed and you would have had to over fill your diff imo.

So save yourself all the headaches first and check axles and seals first.
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Old 09-28-2015, 09:04 AM   #4
 
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Axles and seals were 100% dry. I checked them at track when it happened and the following morning when I was cleaning everything off with brake cleaner.
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Old 09-28-2015, 09:05 AM   #5
 
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I was able to squeeze my hand in between the mufflers and reach on top of the diff to feel the breather... There was gear oil puddled all over the top of the diff.
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Old 09-28-2015, 09:08 AM   #6
 
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Drain it see how much fluid you still had in the diff, refill to proper level and cruise around the neighborhood. Then check for leaks. Just drive long enough to get the fluid warm.
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Old 09-28-2015, 09:28 AM   #7
 
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Quote:
Originally Posted by utryd2 View Post
Drain it see how much fluid you still had in the diff, refill to proper level and cruise around the neighborhood. Then check for leaks. Just drive long enough to get the fluid warm.
Yup I'll get that done tonight.
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Old 09-28-2015, 09:41 AM   #8
 
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My personal theory is that its a hairline crack in the case. When the diff is under load/WOT, the crack spreads allowing fluid to spray out, but when under normal driving it seals itself.

Tonight's test will either prove or disprove that theory.
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Old 09-28-2015, 09:43 AM   #9
 
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Do you have a brace on it?
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Old 09-28-2015, 09:43 AM   #10
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Time for that z06 diff upgrade?
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Old 09-28-2015, 09:44 AM   #11
 
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Quote:
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Do you have a brace on it?
Yes I have the trans/diff brace made by subfloor on Corvetteforum.
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Old 09-28-2015, 09:45 AM   #12
 
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Quote:
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Time for that z06 diff upgrade?
It's already a C6Z diff. I got rid of the stock junk a long time ago knowing it would have grenaded in only a few passes.
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Old 10-03-2015, 11:29 AM   #13
 
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Well we found the culprit. It was the tailshaft speed sensor cracking and pissing fluid passed the o ring. This isn't used on an auto base model because it's in the trans. We fabbed up a cover and sealed her back up.



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Old 10-03-2015, 11:46 AM   #14
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What do you suspect caused it to crack?
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Old 10-03-2015, 11:56 AM   #15
 
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What do you suspect caused it to crack?
1.4x 60' for a about 70 passes. Probably just gave up. Which us why we elected to cover it instead of replacing it
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