many guys on the forum have been pushing big HP/Torque thru F series diffs
paul has a beastial 7M-GTE running thru one and norbie has got a 2JZ-GTE running thru one, they seem to be having no troubles with them, of course its all a matter of how u drive...
so your running a MA45 disc brake live axle rear end in that RA28? thats a rare chunk of steel, many celica guys on this forum would like to get their hands on your rear end... haha no pun intended