my last work , Dentist needed

[filh]

I need a dentist............

Just after 500m , into a rally stage , no noises before , and suddently,
a big CRACK , and i stopped .
No more move possible .
It'(s) was a TRD gearbox , , now a silent one .
I guess it's impossible to get parts to repair
The 4th gear pinions are both dead , but I think that the one on input shaft can't be changed (remaing stock on TRD gear set)
But It can be removed from input shaft.
I can use a stock one from the output shaft.
Any advices welcomed .

Defenatly too hard to drive with a stock gear box (4,7:1 gear end).
Always between 1st and 2nd gear in 90° corners.

regards
Phil