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Cramer explains how the Dow Jones Transports are blocking a major rally

With stocks pulling back modestly as the S&P 500 and Nasdaq slip from their 7-day rallies, Jim Cramer said one index will prove whether the rally still has legs: the Dow Jones Transportation Average.

The "Mad Money" host noticed that the group has been trading lower since its March 1 peak, which he attributed to the narrowing of the overall market rally as investors move to faster growing stocks.

Looking closely at the stocks that make up the transports index, Cramer found a few key trends.

"The first thing you notice with the transports is how few stocks are really doing the heavy lifting of the plus-13 percent, and two of the best performers are related to each other: the railroads CSX, up 50 percent, and Norfolk Southern, up [15 percent]," the "Mad Money" host said.

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Shares of CSX started to rally once Hunter Harrison took over as CEO, mainly because investors felt like the management shakeup would unlock the railroad's potential, Cramer explained.

Consequently, Cramer said the run in Norfolk Southern's stock happened on the hope that CSX, led by Harrison, would try to acquire the fellow rail line.

Other leaders in the group are sparse. Southwest Airlines is up 21 percent on strong execution. Railroad Kansas City Southern and the embattled United Continental were the only other double-digit gainers.

The rest of the group lagged. Most of the airlines offered minor gains of 3 or 4 percent, while truck, freight, and logistics companies like J.B. Hunt and Ryder were down, some with double-digit losses.

"I find the action in this group disturbing," Cramer said. "You remove CSX and Norfolk Southern and Southwest and you've got a group that confirms the bond market's advance, meaning interest rates going down, and not the stock market's rally — stocks going up. There are just too many negatives, with a total of eight down for the year. It's not a group that you want to own."

And while it can be uplifting to tinker with the group, replacing Ryder with competitor XPO Logistics for a 30-percent boost or removing rental car player Avis with its 40 percent downturn, Cramer says the index offers clarity more than anything else.

"History teaches us that you can't look through an index like that, and the only conclusion right now is that the Dow Jones Transportation index offers no solace for the bulls and without a re-acceleration, makes you feel that the rally isn't being confirmed by a group that I have always thought has to be appeased if we're going to get another leg up from here," he said.

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