69 barracuda steerig coupler

5/8-36.
If you get a different coupler or U-joint, make SURE you get the Chrysler splines- there is also a 5/8-36 GM spline, but the splines are a different shape and will NOT fit a Chrysler steering box. Cheap generic EBay couplers are almost always GM spline, so unless it is clearly stated that it fits Chrysler I'd avoid it.