I have a 2004 Ram 5.7 with a bad lifter. How hard is replacement.
The book time for a professional mechanic to do this repair with the special tools is about 9 hours. Most of the top of the engine has to come off.
If you are not qualified or have the proper tools then it should be left to the professionals.
I don't have the special tools for this project or ever attempted a top off on this truck. Who can you recommend to do the repair. If they're in there maybe all of them should be replaced instead of just the defected one.
I would take the truck to your local Dodge dealer; they have the best knowledge and special tools to do the job properly.
As of changing the bad lifter; from my experience as a professional mechanic for 27 years changing one lifter is only asking for trouble and another expensive visit to the dealer. Change them all to play it safe. If this were a warranty job they would only approve the faulty lifter.