ok so I got my 2006 engine for my 04 months ago. when I got it I shifted it and all was well. swapped out the shifter shaft to run my 04 primary cover. I went to shift it on the bench a few hours ago and tranny rrotated freely. pulled cover back off and the drum turns but tranny stays in neutral. primary gearing isn't on if that matters. I hate to ask but really do not want to split the cases in case I'm overlooking a simple answer. it my head it seems the forks have some how come off the drum. if so I don't know how since nothing has changed from day one except shifter shaft. input?