It's important to note that neither creditkarma.com nor truecredit.com provide FICO scores. The former Providian/WaMu cards did.
You had me researching it. Here is an excerpt from some small print at Truecredit.
"TrueCredit is not connected in any way with Fair, Isaac and Company; the credit score provided here is not a so-called FICO score. The credit scores of TransUnion may not be identical in every respect to any consumer credit scores produced by any other company."
So how does one find out their FICO. It is curious to not that when I obtained credit approval for my mortgage loan, I received a letter telling me what my 3 FICO scores were. The scores in the letter averaged about 60 points each higher than the scores Truecredit was showing at the same time. Basically, it sounds like Truecredit is about 60 points lower than your true FICO.
edited for spelling...