I'm thinking!!  That your old TRE's are for a 1 ton.  I know 4x4lab sells steering with either the FJ80 or 1 ton TRE's.  It says they are close, but just enough of a difference.  Which might be the issue you are running into.  Try calling 4x4Labs and see what they got to say.  From my search, it says they are very knowledgeable in this area.   

http://www.4x4labs.com/

Think this maybe the issue!!