Ford's ( F) turnaround is years behind General Motors' ( GM), and the stock is likely to keep falling, Jim Cramer said on CNBC's "Stop Trading!" segment Thursday. "GM is in good shape, well ahead of Ford," Cramer noted. "Ford looks like it's going to go to $5 before it goes to $4." Asked if Ford makes sense as an investment, Cramer said, "Do you take me for an idiot?" Cramer spent most of the segment alleging a market manipulation by hedge funds on the Oil Service Holders ( OIH) exchange-traded fund. Broadly speaking, Cramer believes hedge fund options strategies are maximized if the vehicle trades near $135, and that action in the fund's components amounts to "the tail wagging the dog." "Manipulate away, you'll always get away with it," Cramer said.