Maybe, what else would it be looking for??

Will a NAG1 out of an 06 Charger fit the trans tunnel of an A-body??

No. The NAG1 is gigantic compared to a rinky dink 904 or 727. The only automatic overdrives that I'm aware of that'll fit under your tunnel without chopping the torsion bar crossmember and/or the tunnel will be the GM 200-4R or 700-R4.

This was my main concern. If it won't physically fit, I won't be putting it in. I guess I will use a 727.

So, does anyone make a replacement K-member that uses coilovers for the A body?

R.

PATC gives the complete instructions on how to make a three wire A518od trans work in place of a 727.It is a good swap.

I used the AlterKtion setup in mine. I ordered it without the motor mounts welded in, so I could position the drivetrain where I wanted it. By mounting the engine approximately five inches forward of where a stock small block would mount, I was able to install the NAG1 with NO MODIFICATION to tunnel or crossmember. Of course this was a J body, so it might not work that well in your car. I had to use a rear sump pan, and truck passenger exhaust manifold, but otherwise all of the Charger stuff went in.

I used the AlterKtion setup in mine. I ordered it without the motor mounts welded in, so I could position the drivetrain where I wanted it. By mounting the engine approximately five inches forward of where a stock small block would mount, I was able to install the NAG1 with NO MODIFICATION to tunnel or crossmember. Of course this was a J body, so it might not work that well in your car. I had to use a rear sump pan, and truck passenger exhaust manifold, but otherwise all of the Charger stuff went in.