Yes internal slave ax15. I've tried to even put the top bolts in without any other bolts in and still no luck. I kept thinking it had something to do with the shield. I realized once the tranny was slid into place that the alignment pins are missing on the new tranny which would let the shield move around. I used alignment rods to line up the shield and it just seems I am using the wrong bolts, I triple checked this. One other problem I had on the install was the tranny didn't want to slide flush to the motor, like mabe 1\2" away. I prefitted the new pilot bushing and it was tight but slid on so I got some longer bolts for the two side bolts and pulled it together. I eased each side a turn or two and it slid right together just tight. I think we had the motor jacked to high after I was messing with the top bolts I ended up lowering the motor down to get the top of the housing to come to the motor. Anyway, I've had the other tranny out a couple times so this is not my first rodeo it just seems the bellhousing is not right. Gonna pull the tranny back out tomorrow I guess and check it out, don't really want to if I don't have to, it was a *****. The ax15 is definately heavier. Thanks and sorry I started another thread with this same question, was not getting any replies.