Okla. Stat. tit. 14A, § 14A-3-308: Assumption

If a lender expressly agrees in writing with a subsequent debtor

to accept that debtor as a primary obligor on an existing

transaction in which a mortgage, deed of trust, or equivalent

consensual security interest was created or retained in the original

debtor's principal dwelling to finance the acquisition or initial

construction of it, before the assumption occurs the lender shall

make new disclosures to the subsequent debtor based on the remaining

obligation. If the finance charge originally imposed on the

existing obligation was an add-on or discount finance charge, the

lender need only disclose the unpaid balance of the obligation

assumed; the total charges imposed by the lender in connection with

the assumption; the information required in the case of new

disclosures concerning prepayment, late payment, security interests

and to exclude premiums for consumer credit and property and

liability insurance from the finance charge; the annual percentage

rate originally imposed on the obligation; and the payment schedule

and total of payments based on the remaining obligation.