Okla. Admin. Code § 670:20-39-3
If a vehicle is converted to another type, such as adding a fifth (5th) wheel to a truck to use as a truck tractor, a Body Change affidavit (SOK Form 701-9) must be completed. A title receipt showing the new designation and re-registration will be issued accordingly.
Added at 41 Ok Reg, Number 23, effective 8-25-24