Tex. Fin. Code § 348.302

Notice to a retail buyer of an assignment or negotiation of a retail installment contract or an outstanding balance under the contract or a requirement that the retail seller be deprived of dominion over payments on a retail installment contract or over the motor vehicle if returned to or repossessed by the retail seller is not necessary for a written assignment or negotiation of the contract or balance to be valid as against a creditor, subsequent purchaser, pledgee, mortgagee, or lien claimant of the retail seller.