* Southern African leaders to meet on crisis on Thursday

* Political feuds threaten new Zimbabwe government

(Adds Mugabe, Kabila quotes)

By Nelson Banya

HARARE, Nov 2 (Reuters) - Three southern African leaders will meet on Thursday to tackle a crisis threatening Zimbabwe's unity government, a Zimbabwean official said on Monday.

Swaziland's King Mswati III, Mozambican President Armando Guebuza and Zambian President Rupiah Banda will hold talks in Mozambique, hoping to help narrow differences between Zimbabwe's leaders.

Zimbabwe's unity government, which was formed in February, plunged into a new crisis last month after Prime Minister Morgan Tsvangirai's MDC party boycotted President Robert Mugabe's ZANU-PF over the implementation of their power-sharing agreement.

"The troika will meet in Mozambique this Thursday as part of ongoing efforts to break the deadlock," Tsvangirai's spokesman James Maridadi told Reuters. The three will represent the Southern African Development Community (SADC) bloc.

The stand-off is the biggest crisis to hit Zimbabwe's new government, which has managed to stabilise an economy ravaged by hyperinflation, but is still severely strained by political disputes.