Outer Limits 4x4 Board

hi all just wondering if anyone can help me, my GQ has had a clutch problem 4 the past few weeks we pulled the gear box out to find that the clutch fork had almost snaped in half. I think this is due to heavy duty clutch I have replced it with another one but worry that this may happen again does anyone no if i can get a stronger fork and if so were from. Thanks