Thanks for info. As someone that designs / builds helical diffs (Torsen™), specific information can be hard to find and is always appreciated. When I started working on a design for the M220, I was initially convinced that I was given the wrong files because they were so different from the old 44. So I was real leery about the M190... So, then, is it safe to assume that all Bronco ratios are 3.73:1 and numerically higher, that Ford is only using the one version of the Dana 30 case? Which may be moot as far as Ford is concerned, since they're only using welded-gear versions anyway. But on the aftermarket side, it'll just be the high-numeric versions...Yes, the M190 gears are directly compatible with the M186 (Dana 30) that was used in the 07-18 Wranglers and the M190 in the 18+ JLs. They still use the standard 27 spline D30 carrier that hasn't changed in decades. The M210 and M220 are completely new designs that don't share anything with older D44s.
I own an offroad shop in NJ, we regear 5-6 vehicles a week and sell a good number of diff parts to retail customers for DIY installation. Feel free to reach out if you ever have any diff questions, it's what I do every day.