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Oil Pump Change Out


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I have a 1998 GMC K2500 with the 5.7L Vortec with over 200K miles on original engine.Engine still runs good.Trying to decide if I want to replace engine.Oil pressure has been running a little lower over the last year and now have a very slight knocking noise on warm start up as if oil pump lost prime,but noise is only 1-2 seconds.I'm sure oil pump is showing it's age.My question is,can the oil pump be changed out with engine still in vehicle?It appears I can drop the entire oil pan without 4 wheel getting in the way despite what I've heard.Has anyone actually tried it?Just trying to see if I can take the easy (aka lazy) route or just go aead and switch engine out.

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