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I have never packed a drive wheel bearing. What I always do is coat it with 90 weight and put a little gear oil in the hub before reinstalling it.
X2. Once I have the wheels back on, I will jack up one side of the axle as far as I can and let it sit for a couple of minutes. And then drop it and do the same for the other side. Then I top off the rearend. Haven't had a bearing failure caused by a lack of lube by my doing. Knock on wood...
So after 45 minutes of the very willing employees of autozone attacking the vacuum pump pulley trying to remove it with the entire arsenal of tools at their disposal (without damaging the pulley of course), I wound up buying the power steering pulley puller and taking it home along with my replacement vacuum pump. After another hour or so of manually filing away the puller collars (and my knuckles) it dawns on me to use a grinder wheel on my dremel. Finally got the pulley off the old pump and on the new one, and now all thats left is to mount it on the truck.
I did some searching through the forums and saw some comments to mount the pump on the adjustment plate before attaching the pulley otherwise the pulley would get in the way of the bolts. When I took the pump off the truck the bolt heads were on the opposite side of the pulley making it irrelevant if the pulley is installed or not, is this normal? The way it was mounted seemed pretty in-line with the alternator pulley so I don't think it matters either way, as long as I keep the same alignment right?