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I think the driveshafts were different in 89 and earlier Broncos and 90 and newer Broncos. For example the DS from an 89 AOD may have a different yoke or flange than an AOD from a 90 or 91. The samething for C6 etc. Those can be changed or he could use your shafts. Your tcase would work though, just may have to make these changes.