I need to look at options avaliable to me to upgrade the internals of an IB5 box from a ka.

The car has the rs turbo conversion and the standard 1300 box has started to give up.

Has anyone had any experience with these boxes? What are the weak links? by fitting a quiafe atb slip diff, with a new set of bearings and fiesta rs turbo 3rd 4th and 5th gears be enough to cope with an engine producing around 210 bhp with a torque figure similar?

I want to keep 1st and 2nd as this gives me quick acceleration. Is there anything i have overlooked in regards to weak links that need to be addressed in order to build a box that will last.

Any help much appreciated

Dan