Actaully I don't think they can do it. Rear End Specialties only works on differnentials.

Gary, have you tried contacting Marty? Another option may be to post this question on Pirate4x4 or on a Yota board, as they seem to do these upgrades more frequently then we do. You just need to find a shop that is confident enough to handle a Japanese t-case. Also let them know that you have detailed install directions (which include grinding the t-case for clearance). Good luck!