I need to know if I buy a part from a different truck will it fit my truck
My car has 201987 miles.
My car has an automatic transmission.
If they are both 2004 models, with the 5.6l V8, then yes, in this case, this appears to be a direct replacement. You should confirm this with whoever the parts supplier is for this part.
If you need assistance with the replacement of your catalytic converter I would recommend having YourMechanic diagnose any issues, provide an accurate assessment of any damage, and estimate the cost of repairs. YourMechanic can dispatch a mobile, professional mechanic to your location to service your vehicle.
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