If you're retroporting to BC/CL and your model has animation looping issues: Go into the .M2 (LK version) in 010 Editor and find the "struct Bones" section then change any KeyBoneID above 26 to -1 and re-try porting the model to BC/CL. This worked for me
7.3 animations for 3.3.5 to WoD only
in Retro-Porting
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If you're retroporting to BC/CL and your model has animation looping issues: Go into the .M2 (LK version) in 010 Editor and find the "struct Bones" section then change any KeyBoneID above 26 to -1 and re-try porting the model to BC/CL. This worked for me