the flange is a short cut, if you're into doing things the wrong way or half-a__ing then go for it but it WILL vibe, thats why they don't recommend it on lifted WJ's, the angle is pretty extreme, the flanges make the shaft shorter and therefore, the angles even more extreme. CD has been making these shafts for our jeeps for a long time with a nearly perfect reputation. more than we can say about the other brands out there.
theres tons of write-ups on the pinion yoke/crush sleeve debate, i personally zipped mine off with my impact and zipped it right back on, and havent had any problems, but to each his own. even if you're scared having a shop do it so you cna get the RIGHT shaft on would be well worth the little bit of extra money. i'd be scared to even hit the gas too hard with one of those flanges.
2000 White V8 WJ LSR-6in-35's-LA's-242HD-Warn SOLD and missed very badly
06 GTO - BC Coilovers, JBA Catless mids, Svede Intake