The gimbals can be rebuilt for a fraction of the cost of even used stuff and a heck of a lot less work than pulling the motors and transom assemblies. Look at
www.jrmarine.com and call Ron Bender. He can weld up and CNC the upper swivel area and the side pins. He has a stainless upper swivel shaft that is top notch and all the parts needed.
He has a kit that gives you a template to drill out the back of the transom assbly with special cut down wrenches to gain access to and remove the swivel shaft nut and the steering lever bolt. Much easier than the Merc kit and has a nice stainless plate to cover the hole. Ron is great to work with and is available by cell phone for questions/problems.
I refurbished both gimbal rings, new swivel shafts, gimbal and shift bellows, new shift cables, new steering levers all for <$2,000 for both sides.
PM me and we can discuss if desired.
Before the JR Marine rebuild:
http://www.youtube.com/watch?v=yEC9jtJ3KFg