Auto trans, which did you use?

I used an A518 behind the 5.7l in my '69 Dart.

The amount of tunnel mods were minimal - just some minor tweaking for clearance and a new transmission mount.
The upper portion of the original rear mount needed to be relocated to the top side of the floor pan for tail shaft / OD clearance.
I used 3" x 1/8" flat stock bent to the shape of the tunnel with 2" x 1/2" channel wrapped over it and welded to the original frame (top and bottom).
The carpet and console covers this so it's not noticeable. The lower portion of the mount is quite similar to others that have be posted already.


The best part is ~1850RPM @ 65MPH with 3.55 gears!