Oldschool Redneck Would do my own work,If oil seals are not leaking would try not to disturb them by remuving the drums if possible. If that works wouldn't fill the differential with gear oil leave it 1/2 inch below the fill hole,when level and cold. That will keep from asking so much of the seals,little awkward working around the hubs,however brakes soaked with gear oil are no fun !!
