Current issue with the OBX's (both B and D) is the runout on them i.e they are very slightly oval

this causes them to wobble, and in the really bad cases, cause the tranny to bind up causing premature failure of bearings etc

From the units that were measured, the OBX varied between 0.01" to 0.03" runout. Compare this to the Quaife average of around 0.004", and the MFactory's which are all in the 0.000x" range