terrible grinding sound

[ReV:-O]

hiya,

i just bought a mod1 14T pinion for my converted hyper 8, but theres a terrible grinding sound between the pinion and the center diff, and theres a lot of friction. They are both mod1, so shouldnt they mesh? i've set the mesh correctly and there is a fair bit of play in between the gears. I dont know what else to do?


any help greatly appreciated!