I have a 2007 JKU-Rubicon, I need a u joint replaced and local parts stores keep trying to sell me 297X, so I call the dealer who askes me for the casting number on my stub shaft, saying it might be a discontinued part. Were these joints actually different or were these stubs machined poorly? My stub caps can spin in shaft. Obviously the fix is to replace with aftermarket. Does anyone have any insight into this stub/u joint issue?