gear oil, reuse or not

I hate pressing that pig up in there, have a nut in your hand while you do it to slip on whatever stud you hook, hopefully a top one. When you slide the axles in, youll feel the splines start, just give it a little twist and itll engage the 2nd (like a convertor) if not already lined up. Youll hear a hollow thunk when they seat. If diff fluid is good for 30K, im going to need to go and change mine about 5 times in my truck! :-)

The block is a little metal puck between the axle ends, youll see daylight through the splines if its not there.