I am running 4.10'a in my JK Rubicon axles that are on the XJ.
With the 37" SSR's and steel wheels, they will put a strain on the 4.0/AW4. I run 35" A/T's for DD duties, on light aluminum wheels, and it is fine. Not sure on the new JK engine, never driven one. On the old one, we test drive a brand new JK Rubi and it was a total turd with stock tires! The XJ's 4.0 on 37's would have beat the snot out of it, then gone for a beer afterwards....
1998 XJ on 37's.JK Rubi axles with chromo shafts and ctm's, 4:1 transfer case, etc etc etc.The Cherylkee....
2003 Range Rover HSE, 4.4 Quad Cam.
1998 Range Rover 4.6 HSE
2000 4.7 4WD WJ with a rebuilt motor.
4.3/700r4/new frame buildup (YJ)....
Years to gain the hands on experience, and offer it freely.
Minutes to gain the knowledge from the internet, and quote it just as freely.