If you remove the differential pan cover and notice water in the differential, you might wonder how it leaked in and what to do about it. We recommend catching the differential fluid in a container that allows you to see any mixture in the fluid, so even if you’re not experienced at identifying a discrepancy in the differential fluid, you’ll still notice water or other fluids. If you find water in the rear differential, we review how it happens, how to fix it, and how to catch early warning signs before the axle housing and rear differential collects water and causes drivability problems like binding or noises from the rear differential.