3rd gear grinds? Replace gear box?

3rd gear grinds?
So I bought this '98 honda civic cx(213,000miles) and sometimes the 3rd gear grinds a bit. What would be the cause of it? Clutch slipping?

Also the steering wheel shakes when I broke after a certain speed(warped rotors or possibly wheel alignment is needed?)
And lastly when downshifting 5th to 4th gear I have to shift slow or else it grids.

What could be the problems in your opinion and how much would each cost

Synchronizer for the transmission and new brake rotors for the wheel shake.

Shift fork operates a hub on each side of that hub a synchronizer if worn it or the teeth on the 3rd gear are worn will cause the grind. Needs to be rebuilt. Shake could be bad rotors. Tire out of balance, or bent rim