No, the oem was real low and the shop thought the bearings were marginal at best. They tried to source the bearings locally and couldn't so they put it back together with the original bearings. They filled it with ENOS oil after calling Unitrax to find out if it was approved. I would have installed it myself but if the backlash was incorrect I wouldn't know how to correct it so I left it to "experts". When I asked they pretty much told me the install was idiot proof. Take it apart, put it together and have fun. My diff is loud. It must be the bearings .........

Les

Edit: Synthetic? Oh man, drain that stuff and put in what they recommend. Didn't you read the approved fluids?