[kaycee]

Just did my 63 Impala last week, I pulled my rear end up on ramps you need to lock the wheels when taking pinion off.Remove drive shaft and mark the pinion nut and housing do this to line the nut up in the same place it was at before you removed it. Peel the old seal out and replace,I smear a little silicone on the seal outer edge that contacts the rear end housing so it wont weep out. Replace pinion nut and tighten back to where your marks line up plus a tad more ,this will insure that the crush sleeve wont skate. The pinion nut is a rel PITA to take off and on I used a bottle jack on the end of my 1/2" breaker bar to aid in this