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Q: Why is my speedometer acting weird and the truck shifting really bad/hard?
A: This is usually traced back to the speed sensor located on the top of the rear differential. It is easy to find, just look for the wires leading to it. Remove it and replace it. It is only around $15 from your dealer. If it is covered in metal shavings, have your rear diff. inspected.
That is most likely the source of your cruise problem as well.
Check out the FAQ page at the top of the Forum, it's all covered there, but if you still have questions, feel free to shoot.