Most likely a tire problem or a bent wheel/rim. There is a chance it is due to worn out components in the steering or front suspension.
How to Remove the Steering wheel From a Chevy Blazer 2001
If you are referring to the steering wheel wobbling whilst driving along, then you probably have one or both of the front wheels out of balance. If the wheel wobbles at a certain speed then it may be a problem with the front locking wheel hubs or a bearing problem.
The steering wheel wobbles, because of the unconditional pressures from the ground that is adjusted at speeds when it reflects gravity.
Unbalanced wheels or a bent track rod
Bent rim. You may rotate it to a rear wheel to reduce or eliminate wobble.
possible warped brake rotors. have a reputable mechanic check them.
Power steering pump failing.
Cannot unlock steering wheel on 1991 S10 Chevy blazer.
Yes, the steering wheel bolts should line up just the same. You can do it yourself, just rent a steering wheel puller kit from an auto parts store, and it should be pretty simple. Good luck!
You have to adjust the tie rods ends between the steering arm and the power steering gear, just make sure your wheels are set straight ahead, and that you don't have any alignment problems. If you don't want to do this on your own take the Blazer to your nearest alignment center and have them center your steering wheel.
No, it is illegal to remove the SRS from any vehicle you drive on public roads.