I have the part # at home, won't be there until tomorrow. I believe the drum I bought was used. They stocked a lot of parts. Idaho Transmission Warehouse, 2175 Centurian, Boise, ID, 83709, 208-378-8183, 800-331-1632, FAX 208-323-1264.
They are very helpful people, I spent over an hour in there when I was rebuilding my 205 trying to figure out why my output shaft was different than any other. They called several people before someone at another location had the answer. This is not to say that they don't know what they are talking about when it comes to transmissions, they gave me a lot of great info. I have rebuilt a TH350 and TH400 and bought all my parts from them. If you can't find the part closer to you, I highly recommend them.
BTW, I love my TH400. Crisp shifts w/o being harsh and great part throttle downshifts. Now I just need a doubler for the compression braking.
Brett /forums/images/graemlins/burb.gif