allison uses transynd in there trans, gm uses dex 6 which it is fine , just transynd has longer change intervals and fully syn and made just for allision by castrol
For your 01, I would go with Torque Drive and you will be fine. Give Big Daddy Diesel, Mr. Manners, or Chevy Tough a PM and they can help you out!!!!
__________________ '05 CC/SB, AMSOIL 5w-40 (From Big Daddy Diesel!!!!!!), Cold Air Intake with a dry Nanofiber filter from AMSOIL, PPE Tuner level 1, EGR blocked, MP mod, res. plugged, lost KITTY, finished off the rest with 4" SS Magnaflow, Amsoil Torque Drive, General Grabbers 265
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