[Northridge4x4]

I am pretty sure the OX locker will not fit in the Pro rock.

 

[TeraFlex]

You can use a OX Locker (30 or 35 spline) in either model of Tera44 (Rubicon or non Rubicon).

 

[Dynatrac]

I am pretty sure the OX locker will not fit in the Pro rock.

David is correct but they're working on it now. No ETA as yet but it's high on their priority list.

The ProRock 44 has a unique high clearance housing and doesn't use a standard differential cover.