* S&P 500 seen testing its 2011 high
* Pfizer to sell unit to KKR for about $2.4 billion
* General Dynamics slumps after jet crash
* Dow up 0.1 pct, S&P up 0.02 pct; Nasdaq off 0.01 pct (Updates to late morning)
By Edward Krudy
NEW YORK, April 4 (Reuters) - The S&P 500 met tough overhead resistance on Monday as traders saw little reason to push up stock prices in the face of lingering geopolitical uncertainties that have weighed on equities recently.
The benchmark S&P 500 hovered near 1,333, a level it has been unable to close above since mid-February. That level is double the 12-year low hit in March 2009 and is not far from 1,344, the S&P's 2011 high and its highest since June 2008.
"We have a lot of resistance right above and at the moment not enough reason to push through that resistance," said Frank Lesh, an analyst and broker at FuturePath Trading in Chicago. "Overall, the market is performing quite well and we're holding in here."
On Friday, the S&P recorded its best two-week period since December, and the Dow industrials hit their highest intraday level since June 2008.
The Dow Jones industrial average gained 10.52 points, or 0.08 percent, to 12,387.24. The Standard & Poor's 500 Index rose just 0.23 of a point,or 0.02 percent, to 1,332.64. The Nasdaq Composite Index dipped 0.27 of a point, or 0.01 percent, to 2,789.34.
The lack of significant economic data on Monday, nuclear and other quake-related problems in Japan and unrest in Libya, Syria and other countries in the oil-rich region of North Africa and the Middle East could translate into low volume on Wall Street.
Last week was the lowest in volume so far in 2011.
Lesh said investors would likely stay cautious ahead of first-quarter earnings season that starts with Alcoa Inc next week.
Richard Ross, global technical strategist at Auerbach Grayson in New York, said the S&P 500 could retake its yearly high this week.
"I think the market has enough inertia and the retest of 1,344 is in store," he said. "We're looking for a marginal new high on the S&P 500 setting you up for the next leg of the advance.
"If you did have a breakout which failed, those false breakouts often lead to a fast move in the opposite direction." Ross said.
In acquisition news, Pfizer Inc rose 1.1 percent to $20.60 after the drugmaker agreed to sell its Capsugel unit, the world's largest maker of hard capsules, to private equity firm KKR & Co for nearly $2.4 billion.
Shares of defense contractor General Dynamics dropped 6.6 percent to $73.34 after its business jet unit Gulfstream Aerospace said a jet crashed during a test flight on Saturday, killing two pilots and two flight-test engineers.
Southwest Airlines Co shares dropped 2.9 percent to $12.30 after planes were grounded for inspection. A U.S. safety investigator said on Sunday evidence of widespread fuselage cracks was found on a jet that made an emergency landing with a hole in the cabin.
Deutsche Boerse is holding off on making any decision as to whether to raise its rival offer for NYSE Euronext, two sources familiar with Deutsche Boerse's thinking said on Monday. Shares of NYSE Euronext fell 1.1 percent to $39.15. (Reporting by Edward Krudy; Editing by Jan Paschal)