Wow this thread got way off topic. So would your truck go past 2100 rpm in any other gear? Mine started doing something very similar, it would pull hard up to 2100 then drop off, shift to next gear same thing. cruising 5th gear would slowly work its way up to 2200, start pulling a hill though and it would drop down to 1950-2000 and i could feel it kick in and accelerate to 2100 rpm then drop off again, all while still going up hill. sounds like govenor, yet down hill it would go all the way to 2600, i wouldn't pull to 2600 but it would go that high but no higher. If it is the gov. how do i fix that? i've looked but can't find any info on it.