right - this may well send u to sleep... the hardness results are as follows. all figures are in Brinell, if u care, its more a reletive thing really. to give u some idea tho, regular non treated carbon/mild steel comes in about 130-150ish, and a weld on carbon steel is around 200 Brinell.

i grabbed a few relevant bits for comparison, turns out they are all regular carbon steel, no fancy grades, just heat treated and/or blued.

Cen Genesis Spur Gear (43t) - 540
Cen FF Heavy Duty Diff Gear (43t) - 600
Cen Genesis Pinion (21t) - 340
Cen FF CVD (Outer part) - 520

Ofna Ultra 2 speed Pinion (15t) - 500
Ofna Hyper 10 Pinion (15t) - 400

Stock Tmaxx CVD (outer steel part - not the plastic part!) - 400

all that says to me is that the cen ff cvds are a fair bit too hard/brittle and the genesis pinions are way too soft to deal with the .46 engine, or at least the ones from the batch i have are too soft, especially considering that a .28 will eat the much harder ofna ultra pinions after 1/2 a gallon or so when run on the genesis spurs, also bare in mind a 15t will wear quicker than a 21t. the gen spurs and cen ff hd diff gear are nice hard items tho.

hope u are sufficiently bored/satisfied with that! i dont have any jato shafts as yet to test - sorry.