The only reason I say this is because CAT just hit a 52 week high, but the DOW is at an all time high. I think CAT, right or wrong, can still run. Overvalued? Probably. But its a multi-nat and many many factors come into play that are still as yet unknown. CAT was at $110 in July of '14. Trump loves CAT. Shorting a stock that is making a 52 week high, in my experience, is not the best of moves. We shall see.
As a rule of thumb though, its best not to swim with sharks in especially shark infested waters. CAT would be one of those. Major DOW component. It goes up or down depending on where they want the DOW, not what the company is worth.