* Asia stocks hit 2-mth high, but rally starts to lose steam
* S&P surges 7 pct on toxic debt plan, housing data
* Yen tumbles as carry trades make comeback
* Dollar down, China touts SDRs as reserve alternative
By Eric Burroughs
HONG KONG, March 24 (Reuters) - Asia stocks rose to their best level in two months on Tuesday and higher-yielding currencies jumped against the yen as Washington's plan to relieve banks of toxic debt spurred investors to pick up riskier assets.
The gains in major Asian equity markets followed a 7 percent surge in the U.S. S&P 500 <.SPX> after a surprise rise in home sales, spurring hopes that a recovery is taking hold in the battered housing market at the heart of the global credit crisis. [
]Financial shares extended their rally after investors cheered the U.S. Treasury's plan to free banks of up to $1 trillion in troubled mortgage securities and other loans, part of the array of measures designed to jump start lending and the economy.
Oil prices dipped 15 cents to $53.65 a barrel <CLc1> after reaching a four-month high the previous day. [
]The revival in risk-taking boosted currencies such as the Australian and New Zealand dollars against the yen as carry trades -- borrowing in low-yielding currencies and buying higher-yielding ones -- showed signs of making a comeback. [
]As financial markets have stabilised, gauges of volatility have dropped and made carry trades seem more appealing.
"The long-awaited U.S. programme is finally out, and that is significant enough to bring some stability to the market," said Minoru Shioiri, chief manager of currency trading at Mitsubishi UFJ Securities in Tokyo. "That means the market is likely to have a bias for a weaker yen."
The MSCI index of Asia-Pacific shares outside Japan <.MIAPJ0000PUS> climbed 1.4 percent, taking gains to 28 percent from the five-year low hit last November.
Asian currencies edged up and have recovered as foreign investors have slowly started shifting money back to the region.
"Good news for the U.S. financial sector is good news for South Korean banks as well, as it will ease difficulties getting foreign currency, and foreign capital may feel encouraged to enter domestic markets," said Ku Yong-uk, an analyst at Daewoo Securities in Seoul.
Japan's Nikkei share average <
> was up 1.5 percent and struck a two-month high.But the rebound in stocks showed some signs of running out of steam.
The Nikkei's 20 percent rise from its lows hit earlier this month meets the traditional definition of a bear market rally, and some technical indicators suggested the benchmark index has reached overbought levels.
S&P futures <SPc1> were down 0.6 percent and pointing to a weaker start on Wall Street.
BONDS AND DOLLAR DOWN
Safe-haven government bonds succumbed to the global stock rally but have mostly held up as central banks have taken extraordinary measure of buying large chunks of debt outright to keep a lid on yields.
Such purchases, which in some cases have meant outright monetisation of rising government budget deficits, serve as one means of helping economic growth with short-term interest rates already near zero.
Ten-year Japanese government bond yields were flat at 1.260 percent <JP10YTN=JBTC>, as some investors took advantage of an initial back-up in yields to buy paper as they eye the start of Japan's new business year in April.
The dollar slid back towards the two-month low hit against a basket of major currencies last week when investors seized on the Federal Reserve's decision to buy large amounts of Treasuries as a sign of the ongoing erosion of the world's reserve currency.
As the debate about the dollar's role intensifies, Chinese central bank governor Zhou Xiachuan said on Monday that the dollar could be replaced as the world's main reserve unit by the IMF's Special Drawing Right. [
]The comments suggest that big holders of dollar reserves, such as China, are mulling alternatives in considering a big shift in the global financial architecture that has ruled the post-World War Two period.
The dollar index -- a gauge of its performance against six major currencies -- dipped 0.2 percent to 83.320 <.DXY>. Among higher-yielding currencies, the Aussie <AUD=> was up 0.8 percent and hit a 4-