80W90 is the oil used in all the gearboxes on your Jeep including the steering box.
There are a pair of bearings on the knuckles of the front axle. Quite common for them to be in bad shape. If bad, they could be the reason why you have a wheel that sits funny. Otherwise, the camber and castor of the front wheels are part of the integral design of the front axle. Caster can be set by using wedges between the spring and the axle, and there are tapered shims that fit between the spindle and the knuckle in order to set the camber, but I have never seen them for the M38A1s.
Best bet is to take it in for an alignment and get their report of the overall condition. Commonly worn items on the jeep steering are the bellcrank, the center link, the knuckle bearings, and the steering box. Get their report and then get ready to do some work. The alignment shop will ot normally be able to set the alignment unless everything is up to scratch. The "death wobble" that everyone talks about on Jeeps is usually attributable to worn parts somewhere.
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