Changed out the old diff oil and cleaned the bearings on the front diff, went to to the same on the rear diff and noticed there was no washer between the o-ring and the outdrive retaining pin inside the box. It stuck out to me because the front had washers between both o-rings and pins. I looked at the exploded view, showed a washer....? Am I wrong to think there should be one or is this some sort of change? The car is 15 days old.