Russ,
Not quite sure what your needs are concerning the motor assembly, but you might try looking at the on-line manual and parts document for Gulf Stream versions of the 'above floor' slide-outs made by Power Gear that is at:
http://www.powergearus.com/documents/30 ... _Rev0A.pdf
Two of the slide mechanisms detailed in the above document use the gear motor assembly #523833 and the third style uses #524793. Have you contacted Power Gear for this part or other items needed to fix your slide?
Chuck