It's pretty well covered here Converting HF2AV Transfer Case into Part Time Transfer Case
I spent the last 15 minutes providing my thoughts on this and your site dumped it all ... so, I'll just say the conversion is well documented in these two threads Converting HF2AV Transfer Case into Part...
Installed locking hubs and converted the transfer case to part time in August. Just finished up replacing the timing belt and water pump ... and everything works like it 'sposed to.