Sea Ray

I have the lower half of a Bravo 3 drive sitting in my workshop taking up space.  I twisted the shaft off the upper half while making a full power turn with my 320-my bad, but I wanted to see what it would do, and I found out.  I sent the drive to Me...

2006 320 sundancer-I want to add a Lowrance Hook 7 graph.  Can I shoot through the hull with the transducer?  People have told me to use 4200 to attach the transducer to the hull.  Any input from out there?Thanks