Trying to "adjust" it yourself will likely damage the gearbox further and could lead to dangerous driving conditions.
If you're experiencing issues with your Tahoe's steering, here's what you should do:
* Identify the problem: Is the steering loose, hard to turn, making noises, or pulling to one side? Precisely describing the problem is crucial for diagnosis.
* Check the obvious: Inspect the steering linkage for any loose or damaged components (tie rod ends, idler arm, etc.). These are much more likely culprits than a problem *within* the gearbox itself. Look for play or excessive wear in these components.
* Professional diagnosis: Take your Tahoe to a qualified mechanic. They can properly diagnose the problem, which may include:
* Worn steering gearbox: This is a significant repair, often requiring replacement of the entire unit.
* Worn linkage components: These are relatively inexpensive and easier to replace.
* Low power steering fluid: Check and top off your power steering fluid. Low fluid can lead to difficult steering.
* Power steering pump issues: A failing pump can also make steering difficult.
In short: Don't attempt to adjust the steering gearbox yourself. It's a complex system requiring specialized tools and knowledge. A professional mechanic is the only safe and effective way to address steering problems in your 1996 Chevy Tahoe.