I have a Bravo III with a corroded gimbel bearing. The service manual calls for a slide hammer puller or, in tough situations, an inside puller. I have tried to make one which needs a hardened parts over haul or I need to find one that works. Then what about driving in the new bearing.

a inside slide hammer is needed for tough gimbals,yes there are special tools from merc which make install very easy.i do stock these tools. art

For really bad ones....

Hook up inside puller tool to a 3" tow strap wrapped around a BIG tree
Strap the boat to the trailer REALLY tightly

Hook up big truck and YANK!

Don't laugh, this is what it took to get one out.