I own a F-350 with the 6.0 diesel and was able to find new life for my truck by having the engine bulletproofed-a procedure commonly performed on the 6.0. The rest of the truck was in great shape and I knew that a new truck would set me way back by comparison.
I'm wondering if you could try something similar to extend the life of your truck. A trusted mechanic who knows your truck well - could he simply replace any parts that can't pass inspection or show a history of falling short, also freshen up the transmission and brakes, etc etc, and do it for a price you can afford and give you another 100K miles?
Just a thought and I admit that I am not a Chevy Silverado expert, but I hope this helps. Good luck.
