DenLip said:
Uh...
Part of your list (axles, extra gears) is kinda hard-core for what was, face it, a fairly cheap vehicle. Basically all the things you'd do to beef it up for serious off-roading.
Another part of your list (Pewgoat tranny, 101 connector, I think door hinges) WERE UPGRADED at one time or another... get a newer Jeep!
And some others are just unreasonable. Roller valvetrain for longevity? What, 300k-400k ain't enough for ya? Engines that live as long as the 4.0 are hard to come by! That cross-flow head would likely increase horsepower... but would probably do so at high RPMs... and lose some of the grunt that we love.
Den
The original question did assume "if you were an engineer at Jeep..."
The cross-flow head would make for more efficient intake (by not heating up the manifold) and while we're on the "clean sheet of paper" head, there's no reason it can't breathe as well as - or somewhat better than - a 7120 head. That will make more power at the same speeds we all like (off-idle - 3000 rpm.)
Longevity? Sure - I'd like to see XJ's out there with "Million-Mile Plaques" - a documented 1,000,000 miles without an overhaul or major service or replacement. We're almost there, and the original 4.0 is off to a good start for an MMP.
The axles, extra gears, what-have-you aren't meant strictly for off-road use, either. I was thinking of the "utility" in "sport utility vehicle." Towing, pushing, pulling, all of that jazz.
And, the Peugeot, welded door hinges, and (maybe) the C101 should
never have been used - all bad ideas.
Just my thoughts on the subject...
5-90