This still going on? How the heck are they going to enforce people modifying an old vehicle for off road use only?
Around here (and many areas of the country) there is a dirt track that has a bomber class. Take an old 4 cylinder front wheel drive compact car, remove interior and glass, remove...
I'd say go ahead and do the locker. The only real risk would be the ring and pinion going bad if the backlash was set wrong on the gears. Pay someone who knows how to do it correctly and I really doubt it will matter nor will Ford ever find out.
Working Man's package:
>Manual trans only
>2.7 or 5.0
>Vinyl floors and seats
>front and rear lockers
>steel wheels
>everything else as simple as it can be to keep the cost down.
Power steering and electric starter aren't driver aids that make up for lack of skill. Traction control and rev matching computer are for people with driving that lacks skill or are too lazy to learn.
At this point we should have automatics lasting 300k+ but most barely make it 150k or much much less. The old C6 or TH350 were awesome pieces but they didn't have overdrive and shifted hard (that's how they lasted, no slipping). As soon as they added more gears and slippery shifts they made them...
As with a lot of manuals, most of the problems are from people shifting way too hard or leaving their hand on the knob all the time. Ramming it into gear or thinking they are a racecar driver and shifting as fast as possible. This creates problems in the shifting forks or guide rods inside...
Ford is trying to get maybe 1 more MPG out of it. It's all about EPA numbers anymore. A manufacturer makes X number of these, X number of this, etc and the numbers are somehow averaged and the better the manufacturer's EPA number is the better off they are. So 1 MPG doesn't mean anything to most...