Pulled $2600 out of my 401k, which netted me $2028 after witholdings for state and federal taxes. Will this affect my social security disability benefits? I have been working part-time since December 2009 earning $564 per month also. How much can I withdraw from my 401k without affecting my SSD benefits?

Only earned income counts against your social securiity benefit, and withdrawals from an IRA or 401(k) are not considered to be "earned." So no - it will not affect your SSD benefit. Same thing with other possible sources of unearned income such as pensions, interest, dividends, capital gains, inheritances, etc.

Will pulling money out of my 401k count against my social security retirement benfits

will pulling money out of my 401k count against my social security retirement benfits

No.