tranny question **pleeez help***

ill try to keep it simple. At the moment, i am using my LS tranny on my LS motor. My 3rd gear is dead. madd grindage. no matter at what rpm. i have a J1 (xsi b16) tranny in my room. the diff and casing on it is fucked. also, i have a ys1 casing too. my question is>>Can i put the b16 gears into the LS case and diff?? also, if that duznt work, can i use the ys1 case and LS diff??? pleeez help!! :bang:

shit, wrong forum, dont trip, i posted it in stock engine bay-components already. delete this one. thanx and sorry