I had the same problem today. Tried to find drivers for my T40p.
After spending several hours on the net searching for a mirror, i tried the following procedure and finally succeeded.
1. Navigate to your driver on the Lenovo Website. In your case: http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-41918
2. Copy + Paste the whole link into the google search field.
3. The first result will be the exact same link you searched for. Under the result you can click on a google cache link.
4. After clicking on the google cache link, you will see the same site you searched for but with a download link, which does not work.
5. Copy the name of the download.exe (in your case: 1rd637ww.exe) and search for it on the following website: http://findfiles.com/
6. You will find the original download link plus a link from a second ibm server called boulder or something. The second link works fine for me
http://findfiles.com/list.php?db=Both&string=1rd637ww.exe
Hf, jason.