993 C4 diff sounds

[BrianM]

I have a 97 993 C4. Over the last couple of months i have noticed a grinding noise coming from my diff but only when i'm in wet conditions etc. I assume the torque converter only kicks in then. At first a local specialist and the OPC thought it was likely to be the engine mounts which were in turn putting a strain on the diff which i was feeling thru the pedals and steering. However they have now been checked and they are fine. This worries me as my OPC wants to whip the engine out and carry out any repairs they see fit. Worse case scenario is scary, best case scenario is £2k for the labour to remove the engine give a report and refit the engine. This is something i cant live with and i would doubt my warranty would either. Have any of you guys heard of anything similar. My local specialists are phenominal to say the least, they service more Porsche's than the OPC does, nearly all of them club members. So my confidence in them is very high as they have worked wonders on previuos cars for me, i'm just looking to point them in the right direction if i can. Thanks for any input you have.

Brian

[BrianM]

They are quiet an arogent bunch and the assumption is that the customer know sweet FA and also has too much money. They estimate they will have to get the engine out, strip down the diff, create a report and assuming it needs nothing done re-fit the engine and charge me an estimated £2k in the process. The specialist I use are far more practical and honest i have to say. I'm just looking to help point them in the right direction so i'm not paying for labour time that may not be necessary.

[BrianM]

come on guys has no one got any ideas what this sound could be coming from my diff ?

[BrianM]

Thanks I'll do that.

[BrianM]

the noise is coming from the front of the car, its a C4, thats my worry, if it was a C2 i would be less bothered as the effort to access the diff is a lot less.

[BrianM]

Thanks john, its been puzzling lots of people including the OPC and the specialist as it is only apparent during damp conditions where the torque converter kicks in.