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The oil cooler in these trucks have leaked coolant when subjected to cooling system over-pressure, like due to a bad head gasket. Gasket/seals...

A couple of the block drain plugs are inaccessible without more disassembly (i.e. remove starter on passenger side or other stuff on driver's side)....

When the model year change happened in late 2005 GM was running an "employee pricing for all" promotion. Coincidentally, when it ended the "real"...

Also, your VIN 8th digit should be either 2 or D, for 2006. 2 is early, D is late. (I have no idea what is E) They are essentially the same...

thxs DmaxMaverick

If you're leaking fuel into the valley under pressure, it certainly could be the IP weep hole (inner input shaft seal). It can allow the return...

Years ago I talked to John Kennedy about ordering a fuel gauge. Those pressures you are seeing are what he told me to expect from a 6.5

Thank you for the response! The situation continues to develop. I pulled the intake and determined that the lines and FFM are all good. I am quite...