Yes, the way you can ID the diff between the AX-15 and AW4 (which I think you have) crossmembers is the center section. Looking at it from the top, the AX-15 dips down about 3/4" while the AW4 has no dip; it's straight across. Also the right side indent for the exhaust pipe is formed differently. I've just been through all of this trying to drop the tranny w. an AX-15 member, but it caused my exhaust pipe to rub due to the headers.