Hey Guys!!

A newb here but.. figured you guys could shed some light on the subject.. bought a cusco rear diff to replace my stock one and it seems that my pinion assembly is really bad; mechanic told me that he needs a new assembly for everything to be done right..

so.. what are my options? Do I have to buy a full blown rear differential or where could I find a pinion assembly? I called Mitsu and they said they did not sell it =/

any suggestions?