got same problem with converting objects to vanilla wow, digged some in internet and found there was once in 2006-2007:
3dsToM2
o 3dsToM2[1.1] - v1.1 <July 29th 2006> - 362kb
o 3dsToM2[1.1-PreBC] - v1.1 <July 29th 2006> - 64kb
o 3dsToM2[1.2] - v1.2 <Aug 8th 2006> - 68kb
o 3dsToM2[2.0] - v2.0 <July 29th 2007> - 122kb
o 3dsToM2[3.0] - v3.0 <July 6th 2009> 664kb
* 3dsTexMover - Copies the UV-Coords from a 3ds to a M2.
M2Modder
o M2Modder[Cryect] - Lets you edit properties of m2 Files. v1.0 <April 7th 2006> 57kb
o M2Modder[Vanilla] - v1.0 <April 7th 2006> 62kb
o M2Modder[BC] - v1.0 <April 7th 2006> 218kb
o M2Modder[Wrath] - v1.0 <April 7th 2006> 62kb
* M2Conv - [Schlumpf] Converts 1.12 m2 to 2.x m2s
* M2TBC
o M2TBC - M2 1.12 to 2.0 Converter v0.1 by NiNtoxicated 11/02/07
o M2TBC[Alt] - M2 1.12 to 2.0 Converter v0.1 by NiNtoxicated 11/02/07
o M2TBC[Fixed] - M2 1.12 to 2.0 Converter v0.1 by NiNtoxicated 11/02/07
try to find some or ask people for it, some of listed tools was creaded by modcraft members -Shlumpf
. BTW
LK WMOs woks nice with tbc and vanilla.
Stan