Just to put in my 2c since everybody else is, paint job is last thing to do when you haven't got anything better to do with your $, especially on an old truck. Rattle-can the rusty spots for now if it's through the primer. If you are doing the auto->manual swap anyway I'd strongly consider a G56 over an NV4500 if you tow. NV5600 swap is a little easier, I understand, but as has been mentioned, availability seems to be an issue. If you don't tow, it's probably not worth the extra $ -- I am absolutely happy w/my 5 speed (4 speed... 1st isn't a usable gear, empty, with 4.10s) just toolin' around, the 3-4 gap isn't noticeable at all. Frustrating as heck sometimes towing though. Will probably do the swap myself at some point.