The only conversion kit I know of is the Spyntec (Solid Axle Industries). Works great, improves on highway performance & handling, gives about a 2 MPG improvement. Fixes the front dl vibe issue with stock housing. Unfortunately the total cost makes it somewhat unattractive. You have to swap out wheels, front inner axle shafts, axle u-joints & rear shafts. The latter is probably a good idea, anyway, but with sleeves, gussets & ball joints it all adds up to more than a PR44 or Tera44.
As far as a scrap yard swap, only ones I've seen or read about use Ford or Ram axles with unit bearings set up for the ABS sensor.
'09 JKRU. 4" Teraflex long arm, Teraflex R44 housing, Teraflex / Fox Resis, Poly Performance skids, Nemesis Billy Rockers, Nemesis flares, 37" ATZ P3s on 17" 5x5.5" Trailready HDs, Spyntec hubs, Teraflex BBK, Mopar BBK master/booster, Superior front & Alloy USA rear axle shafts, CTMs, Reids, Synergy drag link & tie rod, WTOR hydro-boosted steering, 5.38s, TF Dual Rate front bar, TF bumpers, Warn Powerplant, Tom Woods shafts, AA xfer case cable, Kilby canister relo, RH4x4 cage.