my sister came back from college and said she had a rythmic knocking, so i drove around the neigborhood and could only duplicate this knock when giving the car more than 50% throttle uphill. she hasnt had any rear end service done, i guess what im asking is how would i check fluid levels in the differential,
i found a hatch in the trunk that gives access to fuel pump but could'nt see a fill plug for the differential. Any help would be greatly appreciated