Lower steering shaft? could be due to salt and/or sand getting into universal type bearings, depending on climate vehicle is exposed too.
As a Gm Tech. i can tell you that we pack your steering shaft full of a thick grease. Not your bearings. the steering shaft is meant to act like a shock, when the grease is not enough the shock can be felt in the wheel. Now Gm is having the dealerships replace the shafts if the vehicle is under warranty
That would be the nut that holds the steering wheel to the steering shaft.
most likely your alero's power steering pump would be leaking from the power steering reservoir, but as an alero owner i have had to replace the whole pump because the pump shaft snapped on me
The vehicle would no longer move on its own unless you have a 4 wheel drive vehicle.
Check out the bearings in the steering column and the knuckles in the steering shaft
I would suggest buying the parts and repairs manual for the vehicle. It will tell you how bolt by bolt.
In general, repairing a steering gear is not recommended for the casual mechanic. Rebuilt steering gears are available at a reasonable cost. A leaky pitman shaft seal is indicative of internal damage. The seals do not usually fail without something else acting as a catalyst. You'll be far better off if you just replace the steering gear. And while you're at it, check the hydraulic fluid for any contaminants. If anything is floating around in the power steering pump and/or the hoses, it would be a good idea to replace them all since it will just cause the new parts to fail prematurely.
Check the recall on the problem with the power steering pinion shaft....maybe what u need instead recall #02v286000 (try motor trend.com or google it)
I would recommend purchasing a shop manual for that vehicle. The manual will pay for itself with the first repair job.
A "U" joint is generally used in the steering column shaft between the wheel and the steering gear. This would be either the rack or the steering box.
It's primary purpose is to control excessive feedback into the steering wheel. For example, when you hit a large pothole, some vehicles would feed back that energy into the steering shaft causing the steering wheel to jump left or right suddenly which could cause the driver to loose control of the vehicle. Not all vehicles need one of these.
It could be from worn bearings on the shaft that the pulley turns.