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It took a while, but it's done. I initially took it in to have the front seal replaced, find the "thumping" in the front end and to "time the CP3". I thought for sure it was the front seal, as there was oil all over the front cover and looked to be coming from the crankshaft seal. They replaced it, and while in there they did the CP3 timing thing. The thumping was worn out stabilizer bar bushings!! The axle U-joints were also toast.......greasables too!!!!Anyhow, I get the truck back..............sounds super quiet now..........that CP3 timing thing really does work!! Drive around to do some errands and guess what?????? I've still got the oil spots under the truck at each stop!!!! It's a similar pattern to prior, but definitely different. I call the shop up and tell them I'm bringing back in Monday AM as it was Saturday mid afternoon now.Bring it back on Monday. Get a call on Wednesday telling me they found the leak, but that it requires major truck/engine dissassembly!!!! It's a gasket that goes between the block and a machined "spacer" that the front cover bolts to. The bolts from the front cover actually go through this part and into the block. This piece is what makes space for all the gears behind the front cover.Well to replace this, you need to essentially pull the front of the truck off, pull the valve cover, pushrods, cam, etc.........!!!!!!! They're good mechanics over there, but the owner is buds with a Cummins tech and was getting info from him how to do this more efficiently.Long story short, I'm out more $$$$ than I wanted to be having to take it in twice, but the truck is brand new quiet now. The CP3 timing thing and the valve lash adjustment because of having to pull the rockers, pushrods etc. have made my truck so quiet, and so smoothly powerful now, it's almost scary. Pat, the owner of the shop even drove it around for a day to make sure there wasn't any leaks. He asked me when I picked the truck up if I had a chip in her. I said no, I have a Smarty on her!!!!