Yep, the OBX M190 and M220 rear locker are 4.27:1 and the BD uses the 4.46. The BL, WT, and FE all use the M210.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...
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