Its got to be either gear lube or brake fluid and you need to identify what it is. Buy a can of brake fluid and see what it smells like. If your leak smells like brake fluid, then thats what it is. If it smells like a skunk, its gear lube. If it has no smell, its not a leak. Its just water left over from washing. Where did you squirt the water? In order to get the drums off a 1 1/2 ton, you had to pull the axle shafts out which exposes the banjo housing. If you got water in the housing, you need to drain the rear end. Water settles to the bottom after a while. I would crack the drain on the 3rd member. If there is water it will come out. If its lube, you will learn how gear lube stinks.
