LOL, its ok to have used dirty truck - there is no shame in trying to get it sorted out. It would be shame if you got it brand new and get to that state though. I dont understand how people may spend so much money on getting expensive SUVs and then completely ignoring even basic maintenance.
Melissa - its getting like that b/c of bad oil changing intervals and b/c of bad oil/additives.
As of process. Unfortunately I dont have pictures handy (i actually made shots when i been cleaning mine) and it may be not very proper, but ...
Easiest way to deal with gunk from parts that you dig out from there - is to use cleaning brush like they selling in painting departments, and some good remover. For parts outside of engine and where no seals involved best results i had with paint remover from ACEs hardware. Cant remember brand right away.
What i did - i set parts outside. Sprayed them with remover, then cleaned with brush, then sprayed with hoose ,then repeated. Untill i been blue in the face. That way all easily removable parts were sorted out. Then shafts needed more attention b/c there is laquer accumulating under rockers, so i moved those around, cleaned up with brush and kerosine (to push water away easier).
Then its all been dried up and oiled with lucas oil throughly but not excessively.
However for parts that you cant remove - be very carefull, as you can damage seals and hooses and all sorts of stuff with very active solvents. There you will have to find own ways.
I used kerosine based spray and been plugging all places where i didnt want with shop towels. Then wiped it all clean
Its still got some bits in there, but it will get better with each oil change and flush.
Its getting on nerves and its damn smelly job, but it helps truck to run.