I have only had one real problem with the Bronco II that left me high and dry. The computer module went out the day after I purchased it. I was not amused, I bought it from a dealership and I made some serious noise until they offered to replace it at their expense. (no warranty was offered at the time of sale)
Since then all the modifications made to it have been to trick it out or upgrade stock items.
Bigger radiator installed helps the overheating problem, replaced drive line and C-V joints with larger drive line and U-joints, killer stereo, bass boost, speakers, amp, equalizer make my rig rock.
4" lift kit, 33 x 12.50's give me some clearance, beefier transmission and rear end and yes the stock 2.9 got good mileage and did not leak a drop of oil... The new 302 with headers and dual exhaust make my B-II breathe fire with the "big boys"
I have changed the paint like some people change socks... It is currently a beautiful Metal Flake Denim blue with Opalescent Fuchsia and Royal blue pin-striping. I sure like the effect under night lighting in town.
My sons bought a neon blue under carriage light kit for my birthday and several other neon accessories to top the "look" off. Nothing, but compliments from people anywhere I go. I have the added bonus of the workout my arms get from the constant polishing I do to it.
Mechanically I have never had a vehicle so dependable and honest. Easy to start, everytime. The biggest safety red flag I have for this rig is the high possibility of tip-over. B-II's are NOT stable for fast turns, slick roads or side-hilling. Be aware save a life! Use your head off-roading, if you have a lick of sense you'll be just fine in a B-II.