From what I hear u can't take the LSD from an m2b4 and put it into an m2a4 or other non-lsd tranny, it won't fit insidde the housing of the tranny. If u wanna put lsd in ur tranny theres a couple diff options. Cheapest would be phantom grip, then there's obx lsd, a little more spendy, and the best being quiafe, it's around 1k. Depends on ur price limit.