Thanks for the suggestions so far. I figured there were boneyards out there full of these things but have no idea how to look for them.
If I go the route of adding tilt to a dozer, I'd do it in the most economical way, mainly because it'll be a ranch dozer and not used to make a living. Was hoping that most Cats were built with a standard pump/manifold layout that you could easily tie into for adding a single cylinder operation But it sounds like Cat used specific parts for tilt and non-tilt dozers so maybe it's not as straightforward or simple as I hoped. I'm assuming there is a constant high pressure port or line I can tap into and just add my own valve- is that possible?
D6c10k- I passed up on a clean 10K a couple years ago and I'm kicking myself for letting it go. It was going at a premium but I passed on it because it didn't have the turbo (minor gripe) and an angle blade (no tilt which was the real reason I passed). From my research, it's not possible to make an angle blade into a tilt, even it's for light work so I passed. That 10K was one of the first ones I looked at it and didn't realize most other D6's for sale would be either worn out or had a major trans or engine issue. Looking back I should have bought it and been happy pushing cedar and making roads in the Texas Hill country. I think I 'need' tilt more than I 'want' tilt as I'd be cutting roads with ditches, cutting/clearing drainage lines to the stock tank, etc. I wouldn't be pushing hardwoods, popping stumps, or ripping so maybe I'm just being too picky.