How to tell if power steering pump or rack and pinion going bad?

Turtle

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My infinti G35 with 140k sudden has a problem.

I never had a PS problem so I don't know how to go about figuring it out.

-pump is clean and no leaks what so ever.
-fluid was not low or anything.
- steering is stiff as hell. When I turn. I have to wind it back to center.
- never had a noise from the pump ever
-newer serp belt installed so it's not slipping.
-no leaks or torn boots for the rack.

With engine, wheels in the air and someone turning the wheel from lock to lock. I didn't see much fluid moving in the reservoir.

What do u guys think? Is there a simple budget friendly way for me to test either. Definitely feels like the pump as I've had the car stall on me before and it feels similar.
 

Turtle

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Well not the pump. Just swapped with another and same problem,give a take a little more noise from pump... Guess it's the rack.
 

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