Any tips on how to drain and refill the rear axle in a 1986. I figure I can use one of those hand pump brake bleeder setups to suck out the old lube, but I'm looking for a shortcut to refill the axle. Also what is the correct ratio of lube to anti-slip additive? I thought it was one bottle of additive to one 23 oz bottle of GM lube. Not sure and don't know where to verify it. I know someone on this forum has the answer and may be willing to share.