You will need to shave your axles if you're fitting a TRD LSD centre AND your axles are from a non-LSD open disc brake rear end. MR2Drift can confirm that for you - I was told it was a very long job which kept neighbours awake early in the morning.
No probs if you go for either a KAAZ or Cusco centre as they are made to accommodate both LSD and non-LSD axles as long as you match zenki LSD to zenki axles.
Either way, shaving axles isn't too hard but if you want to save yourself the extra work, just go the KAAZ or Cusco then if you can find one.