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UPDATE: Took my HMMWV out last weekend. Drove 5.5 hours from Portland out to Christmas Valley and played on the trails and sand dunes for 4 days. The Air Lockers worked flawlessly and not a drop of gear oil out of the vent lines. I kept my homemade catch cans on the diffs so I could monitor and...

Here's the fix: My installer Leonard, drilled a 1/4" hole at a 22.5-degree angle upwards in through the bottom right "fixture hole" (To clarify: These holes are not "case spreader" holes. A case spreader with ruin your diff because it's aluminum so don't use one) The pictures above should give...

Sucks about the tendon, takes forever to heal. Be very careful where you buy half shafts. There is a huge batch of GSP H1 Rear Half shafts that are being sold that are too long. I even had them contact the warehouse in CHYNA! The warehouse was like "oh yeah you're right they're too long. But...

Matt, So I pulled my diffs out again (8th time this summer, grrr...) and taking them to my guy this afternoon. He will drill relief holes under the carrier bearing seats to allow the oil to drain back into the main case. Apparently, Jeep AMC 20's diffs already come with relief grooves in them...

What I learned: The ARB locker and shims sit close to the journal bearings not allowing gear oil to drain back quickly enough into the main housing area of the diff. Has nothing to do with the locker operation. When driving it pumps oil in between the journal and stub shaft bearings, can’t drain...

Matt- I just had ARB 187 lockers installed in my AMC 20 diff also. I'm having the exact same issue you are on my rear diff. Any advice?