I am looking for a D60, but I am still new to swapping out of the drive train. This may be a dumb question, but will that fit under a 1986 FS Bronco w/o any problems, or do I have to do a little modifying, or a lot of modifying?
It'll bolt right in place of your current 9" or 8.8 without any mods to the spring pads or springs themselves. The pinion on a D60 sticks out a little further though, so you might have to shorten the driveshaft a little bit, unless you lift it at the same time. I replaced my 9" with it, and also did a 4" lift at the same time, so the original driveshaft ended up being the perfect length. The disc brake calipers require a larger master cyllinder as well. Most people go with an F350 MC.
Someone just bought the detroit out of it, but I have the rest of the axle still intact. I can put the original open carrier back in it if someone wanted me to. $200 for what's left: D60 - 4.10 gears - Disc brakes.