if it was mine id change all the bearings and seals, check the axles for wear near outer bearing, and you can tell if the rear gear is good by how it is wearing. both sides of the gear should be smooth and shinny like chrome if there is any lines or steps where the gears have ben running the gear will never be silent again and will need replaced. the posi should get new clutches if you plan on running the car at the strip. they are fairly cheap and it will help your car hook up. at 240.000 miles they are surly worn.