I'm going to do this and even have my 14 bolt here but I have yet to really look at it. 75f350 knows by heart what needs to be done as he has done many of these, but he has fallen off the face of the earth and hasn't looged in since December...

As for what needs to be changed - my truck is a 74 F-250 4wd so I'm pretty sure I will be changing leaf spring mounts. You say your truck is a 77 but don't say 2 or 4wd. With a 2wd you might not have to change spring perches.

The only other things that MIGHT come up would be the pinion yoke U-joint size. The one on the 14B MAY be bigger, and the whatever you need to mess with for the parking brake.

I will be running disks so I need to mess with this anyways...

If you get into doing this take some pics and notes and post up