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Does anyone know of a company selling deeper transmission oil pans for the C5's? I know not just any pan will due since the A4 does'nt have a dip stick but rather the inspection port bolt. If not maybe its possible to buy a regular 4L60-E pan and measure down the correct distance and professionally drill and weld a hung for the bolt.
I thought about a deeper, finned pan to aid in cooling, but have not found one. I also worry about ground clearance on a lower pan. I'm sure you could put in a drain plug if that is all you want. I would rather just change the filter each time I change the fluid, so I would leave the stock pan.