Greg, their were 6 TD battalions sent to the PTO.: 632nd, 637th, 640th, 671st, 806th, and the 819th.
I was able to locate some histories of these TD battalions that may assist you in your search.
The WWII Tank Destroyer Society:
http://www.lakemartin.net/~cfrench/Some addresses and teles:
The 632nd: 632nd Tank Destroyer Battalion,
Company A
Ms. Cynthia Byer Bottom
Route 1, Box 247
Covington, Virginia 24426
(Newsletter)
(703) 962-3071 (H)
(703) 962-2248 (O)
632nd Tank Destroyer Battalion, C Company
Mr. Michael J. Fojtik, Jr.
711 Crabtree Lane
Racine, Wisconsin 53406
(Newsletter)
(414) 632-3611
The 640th: 640th Tank Destroyer Bn
Mr. James H. Pittenger
500 Secret Town Lane
Colfax, CA 957l3
(916) 389-2433
The 806th:
806th Tank Destroyer
Battalion Association
Mr. Charles R. Rich
1704 N. Mohawk Street
Chicago, Illinois 60614
(312) 642-5412
The 640th:
http://www.geocities.com/heartland/acres/1442/tank.htmlThe 671stI hope these help a bit. I'll look for more as my time permits.