Unfortunatly the old choclate box will give up at anytime. Uprated or not.
I had Sunnys old box out of his Fiesta. Even after recon, with all new parts 3rd gear was still stripped bare.
Lots of torque and hills dont mix.

That's on low boost!
Have my std box in at the moment and have gave it death running the same boost and it's suvived upto now. Just shows.