Well I've searched everything and I guess the best answer is to do the spin test or possibly call the dealership
Okay after going through many vin decoder websites I found one that is AWESOME https://jeep.custhelp.com/app/jeep/eqlisting_detail/session/L3RpbWUvMTM5MzY0MzI4OC9zaWQvWGxOMmc2T2w=
Hmm mine pulled through, shows I have 373s. May just be the year model
You may have a tag on the diff cover. Also you can Jack it up and spin the rear tire and count how many times the drive shaft rotates.