So I bought a new truck and changed all the fluids. I bought Rock Auto American Standard Gear pads because they were half the price. I did everything right - wiped the mating surface with a brush and even replaced the differential cover, but it's still leaking. 2 weeks later I changed the fluid again, this time with a LubeLocker Pad. That works great. It has multiple layers of rubber for tightness and I have no doubt that it will last a long time.
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