I have a 14 foot aluminum grumman. The boat was given to me by my grandfather many years ago. I have upgraded everything and made nice additions. Now, it seems that that transom wood needs to be replaced. I am wondering if anyone has done this before, what wood to use, and how difficult it is, along with any other tips. Thanks guys.

I can't help much with how to etc. As far as wood, folks I know have used marine grade plywood, pressure treated plywood, and form ply. If you can get marine grade that's the route I would take. Form ply is used for concrete forming. It's pretty tough and resistant to water and generally pretty available. I would not use pressure treated. Whatever you use, I would seal it after it is cut to size and drilled. Pywood's weak point as far as moisture absorption is the ends where water can get between the layers so pay special attention to those areas.

One other thing. Make sure any fastener that you use that passes through the transom is ok to be in contact with whatever wood you use. Probably not super critical in your application but some of the wood treating chemicals can wreak havoc on dissimilar metals in fasteners over time.