NEW YORK (TheStreet) -- Cummins (CMI) - Get Report may have thoroughly beaten Wall Street's expectations of its second quarter but investors should still sell or even short the engine-maker's stock , said Tony Sagami, editor of the Rational Bear.

"The Dow Transports is in a bear market. Those stocks have been falling like crazy and the Dow Industrials have not followed it down," said Sagami. "But I don't think it's going to take too long before it follows suit and all those transportation stocks, including Cummins Engine despite their short-term success, are going to have some troubles going forward."

Shares of Cummins have fallen nearly 10% so far in 2015 compared with a 2.6% rise in the S&P 500. Earlier this week the engine-maker said it earned $2.62 a share on revenue that climbed 3.7% to $5 billion. Analysts were looking for Cummins to earn $2.56 a share on revenue of $4.94 billion.

While its status as a heavily shorted penny stock makes Arch Coal (ACI) shares extremely difficult to short, Sagami said investors should sell instead of hoping for a recovery. Shares of Arch Coal have fallen 99% for the year to date. The company reported a second-quarter 2015 adjusted loss of 73 cents per share Thursday, wider than Wall Street's estimate of a loss of 59 cents and the year-ago loss of 46 cents per share.

Sagami is bearish on Ford (F) - Get Report due to worries over a strengthening currency and also despite its recent second-quarter earnings results. Shares of Ford are down 3.4% thus far in 2015. On Tuesday Ford reported a second-quarter profit of 47 cents, beating Wall Street's consensus estimate of 35 cents per share. The automaker posted revenue of $37.3 billion in the period, which beat Street forecasts of $35.9 billion.

"The U.S. dollar is on a roll and it's going to get even stronger when the Fedraises rates," said Sagami, adding that the Fed's policies are going to "kill the multinationals" like Ford.

Finally, Sagami recommends investors short package delivery giant UPS (UPS) - Get Report. Shares of UPS have dropped over 7% this year. UPS posted earnings of $1.35 per share this week, beating the expected $1.26 per share and up from last year's $1.21. Revenue was down to $14.1 billion, missing estimates of $14.5 billion.

"Even though they have fuel going down, they are still saying their future is not so bright -- so listen to them and not what the Street is saying about the strength of the consumer," said Sagami.