IIRC it will fit just fine. I don't know if anyone on here that has done the 3.0 conversion has an ATX or not, but I am almost positive it bolts up just fine. Now the ATX tranny is supposedly only rated to 200 ft. pds tq, and the 3L hybrids are in the 180's I think. So If you have some serious mods your tranny may not hold up. I really don't know too much about this, so someone else on here that knows more will either refute that or confirm that.