It requires some expensive special tools and specialized knowlage to repair a rack and pinion steering gear, it is easier and less costly to replace the rack and pinion with a remanufactured unit than to purchase the special tools to repair a rack and pinion steering gear
Most rack and pinion assemblies require specialized tooling and machining to repair. That is why it is most common to replace the assembly with a professionally repaired or rebuilt unit.
Free Nissan Repair Service Manuals - cardiagn.com/category/nissan-repair-service-manuals/
Just had this done on my 2002 4wd Dakota for about $160 including a pinion repair kit installed at a NAPA repair shop. 2004 shouldn't be much different. I think the pinion repair kit was about $30, so less that if you don't need it.
Yes, you can buy rebuilt or new parts.
The question you ask is too involved for a proper answer. You may want to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
350 to 400.00
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buy yourself a repair manual and just do what it says.
Buy a repair manual for your car and do what it says.
Pho1a15v