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How loose is a little loose? If you can feel, but not see or hear, a little click of movement when you grab the top of the tire and shake in and out vigorously, then you can adjust them and probably go a long way yet. If they are so loose that you can see the wheel wobble, the bearings have been badly beaten up and won't last long even if you adjust them now.
I try to replace wheel bearings and brake rotors at the same time, while I'm in there. Aren't your rotors about due?
Adding grease is an excellent idea, IF the grease you add is the same kind that is already in there. Bearings don't necessarily respond well to having two kinds of grease in them. If you plan on replacing them soon anyway, it doesn't much matter whether you add grease or not. If you are shooting for 200k, you should figure out what kind of grease they have in them.
If you don't have the service manual (or even if you do) the old mechanic's method of adjusting ALL tapered roller wheel bearings on passenger cars is as follows:
Get a flat blade screwdriver
Tighten nut until snug (a little extra rolling resistance) when you spin the wheel.
Take your screwdriver and put it between the edge of the big washer under the nut and the inside of the hub. Back off the nut little by little. When you can just move the washer under the nut by twisting (NOT PRYING) the screwdriver, the nut is at just the right tension to load the bearings properly.
If the wheel still has play after this adjustment, either the bearing is shot or the looseness is elsewhere in the suspension.
As noted elsewhere, a new cotter key is a good idea.
Happy bricking.
1991 245 180k miles
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