If you were to repay the 401(k) loan immediately prior to bankruptcy, the trustee could claim that it was a fraudulent transfer or preference, intended to defraud, hinder or delay a creditor claim. On the other hand, if you do not repay the loan, the court will deem the money as a distribution, rather than a loan, since you are actually borrowing the money from yourself, and the distribution assets will be available to pay creditor claims.
So, you don't really have much choice other than to repay the loan. Waiting at least 90 days would take it out of the preference category, but the trustee could still sue you and the transferee corporation for the allegedly fraudulent transfer.
Hope this helps.
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