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Thanks for the insight - glad my leak was not a blown rear seal.
I have a '93 S10 Blazer 4x4, and had the same conditions: pouring oil.
After going to the Chevy dealership, I got an o-ring & gasket kit GM#88893989 for about $5.
After removing the skid plate, the 2 bolts were removed from the adapter to the block.
There's an additional clamp at the power steering pump to hold the hoses in place. This needs to be removed to allow the adapter to slide around.
However due to the 4wd, the front differential was in the way, so I could not drop the adapter.
After blindly feeling the adapter on the top, I did not detect an old o-ring. It must have disintegrated or completely flattened or was never there. The new o-ring was able to slip into place, and was able to mount the adapter back to the block with no problem.
That fixed the leak. Took a little more than 1 hour to do this in the driveway.
Now I've got a new problem: from driving around with little oil, I've got a blown head gasket.
I also had an '88 GMC S15 which the adapter leaked. All it needed was a little bolt tightening.
I would suggest buying vinyl gloves when doing this repair, it's a very messy job.
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