Originally Posted by RamTech
I've never replaced one of these plugs or seen a problem with water intrusion. The fluid level should be about 1/4" below the plug level.
^^^^ That's good feedback, I popped mine off to take a look and it's just as RamTech said, 1/4" below the plug level. Use the same as factory, Here's the specs from the service manual:
MOPAR® Synthetic Gear Lubricant SAE 75W-140 (MS-8985).
Limited-Slip Rear Axles require the addition of 118 ml (4 oz.) MOPAR® Limited Slip Additive or equivalent.
GL-5 SAE 75W-90 (MS-9763) or equivalent.