So i did some research and found someone from HPtuners and found the user hiddeous had compiled a excel sheet for the ZF transmissions, i have edited it to suit the BTR gearboxes, Full credit goes to Hiddeous for making the file.
instructions are to fill in the yellow sections with the desired data, i suggest filling out desired shift speeds in KM/H then look at the engine RPM its shifting at then lower it to suit so your not redlining it then copy the final OSS table
Sorry if this isnt aloud admin, i was hoping it would be able to help others out
BTR Shift Tables v1.0.xlsx