[hogster3]

I have a 2000 silverado 4.8 extended cab short bed pick-up with a shifting problem.

At 50 m.p.h., it keeps shifting up and down. It is only about 200 rpm difference, but it is annoying. Any speed above or below that it is normal.
I just noticed it when i put a flowmaster 40 on. The tack goes from 1500 to 1700, and back over and over.

Could this be a sensor of some kind? And if it is can I replace it myself?

Thanks for any help