Got a 2013 Grand Cherokee 5.7 Hemi AWD with a rear LSD. Looking to change all gear fluids and transfer case fluid soon. Its physical owner's manual makes it clear that the rear is 75w-90 and the transfer case uses ATF+4, but the front diff specifies 75w-140? I looked at Jeep forums, which lead me to look up the PDF of the manual online, and now it says 75w-85 for the front and rear. Which one is correct, 75w-85 or 75w-140 for the front diff? If it is 75w-85, I'm just gonna get 75w-90.