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the diff cases are all the same, it’s just the gearing that changed...any of the yokes will fit into the diff, the DS you have is just more beef.

And as far “know for sure” the shaft you chose to use is not the normal folks use for conversions, the 12447113 or 7113-1 cut down is normal, at least it is in my shop. many many m998’s already were converted to 1330 u-joints during reset, so the 12447113 would drop right in After adding the...

Greg gave you the part number in the post above. Also, utilize vendor resources, Kascar, Hummerpartsguy...they can answer your questions quickly on the phone, tell you all the application etc... https://www.hummerpartsguy.com/search.asp?keyword=5937525&search=

https://www.hummerpartsguy.com/search.asp?keyword=2520-01-424-0425&search= and this shaft will need the yoke Greg quote, also will need new straps and bolts for that yoke

12.1 GVW 32 spline DS 12469284 “REV” trucks 10.3 GVW 32 spline DS 12447113 “A2” trucks

An A2 rear Differential yoke is not “12k”, An A2 diff is 2:73 and uses a 1330 u-joint, the “12k” you reference is a 1350 IIRC and is even larger U-joint required larger caps.