provitvasser, in doing so you must be careful that the amount you convert to Roth is not less than the amount of your nondeductible traditional IRA contribution as a result of investment losses, otherwise you will have impermissibly rolled to the 401(k) some money attributable to of your basis in nondeductible traditional IRA contributions even though the nondeductible contribution was made after the rollover. While it's in the traditional IRA, leave the nondeductible contribution in an investment that cannot lose value.
