I went through 2 gearboxes in 3 months.
Thought fook it and now am raping a Stg 2 Bernie Box - I am all praise for this box, the diff really performs well and lots of traction these days, have just persuaded a mate to get the same, hes saving for it now, £800+vat or thereabouts!
Im running over 200bhp, proven, 5 months of moderate ragging and not a squeak out of it yet.