What CVD Shaft ? for my FLM-Maxx

Hello,
I have a problem with my Hot Bodies Diff and Bulk Head FLM. ( My Monster Truck )

I do not know what mount CVD shaft? A friend told me that the CVD options will be too short ...

I have to mount the original Maxx 3.3?

I can not mount options TRAXX, RC BEST, TSAIS, RD LOGICS? Unlimited Engineering and shaft?

Thank you for your help !

Ps: Sorry, i'm French, my english is poor