Following this post as I am curious as well. Can't directly answer your question but we just had a new diff put in our 18 and it was an updated part number for the full diff assembly, 1334182 is the new part number and 1333745 is the old part number. From the outside, the case is different than the 2018 diff that came out of it. It's similar in shape and obviously bolted in but it's definitely different.So the part number for the 19 Turbo Sprague and gear set has changed from 18, anyone know what changed other than part number? From measuring mine and others it appears the window have a larger OD in the inside part.