How sure are you of your speedometer?
I gotta tell ya, 2000 @ 50 sounds absolutely perfect. That gives you an all-day fast cruise of 60 - 65 @ 2600 which, to my way of thinking, is just about ideal in every way. I don't know the numbers for your engine, but mine develops peak torque at 1500 rpm. Just above peak torque is the most ideal engine speed to sustain at a light throttle setting for best fuel economy.
This is to say that everything in your truck is completely relaxed and working at peak efficiency at 50 - 55mph. What could be better? If you got to a hill you needed to pull hard on, you'd downshift at 50 mph and come into 2nd at around 3100 which, again, is perfect for a high-demand engine speed, comfortably below the redline, but well into its power band.
I dunno. Any of you OF's think I'm wrong on this?
If it's working right, there's nothing to fix.
As to your spare parts, hang on to 'em all until you know what you have, and if you'll be needing them.
