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To replace the springs, jack up the axle high enough so you can place jack stands under the rear trailing arm mounts on the chassis. Remove the tires and lower the axke. Then, you need to remove the lower shock bolts and the sway bar mounts from the axle. also loosen the rear brake manifold so you don’t overstretch the brake line. Once that’s done, you’ll be able to drop it low enough to replace the springs. To replace the left spring, put the floor jack under the right shock mount and raise it to flex the axle. The left spring will basically fall out. To replace the right spring, jack under the left shock mount.

well, i dropped about 250ML of oil and replaced the same amount with the Lucas, and basically no change. the noise is slightly quieter, and valve train noise is also a little down but other wise 0 change in oil pressure. I'm convinced now its probably just gonna stay that way, because I checked the oil for dust and nothing. As long as it runs and moves under its own power, I'm ok with it for now. I'll run it with the Lucas and then next change ill just go with a 10w-30.

Thanks for the response. Yeah it is true we run a 5w-30 in the winter and its a very common grade here, but its mostly 10w-30 as well, but in my climate the summers get pretty hot and all the sudden go to freezing. My 6.0 powerstroke runs a 15w-40 pretty much all year round. though it doesn't like starting in the winter, once its warm no problems. I do regret not going with the 10w-30 but live and learn. although its not a high mileage engine with only as of now 96,200 KM, I'm trying to keep it lasting as long as I possibly can, but that noise is kind of a new one. it has been making it for a while and though I am worried about it, I'm not loosing too much sleep over it, as long as i keep it above 2k, no noise and it gets me around fine lmao. I did not check the gauge, nor do I have a mechanical gauge to test it with, how ever, I do believe my gauge is somewhat accurate as the readings I do get are some what expected like my idle pressure and the 60 PSI I get on a cold start. And as my RPMS go up so does the pressure, along with the noise going away. I have yet to add the stabilizer, will probably do that tomorrow afternoon, but I'm hoping it will at least work enough to get me by till I change to a 10w-30 and know I at least got something out of this expensive jug. I am confident though that its not a lifter noise as I can hear the "knocking" only when I lay under, or put my ear in the wheel wells. Although I'm not ruling out lifter, it just sounds like that area. I'll do more investigating before I throw in the Lucas, but for now I'm just trying to grab as much info as I can. When it isn't making the tapping noises, the only other noises I hear are the typical valve train clicking you get on idle or even a raised RPM. With such low KM on the motor I find it hard to believe its a rod bearing that would be making me lose my oil pressure, and more likely a cam bearing. but the one idea I've had, after reading a few posts is it could be something with the pick up tube? is it possible for the pick up tube to leak before the pump and maybe its leaking out before the pump or getting air? Just a thought I had read and have set in the back of my mind as a possibility if its true.