help with tremec 3550 please

From your description, it sounds like the original Tremec 3550 TKO, a high power capacity version of the 3550.
See http://www.ttcautomotive.com/English/products/TR-3550.asp#Car for specs

Visit Tremec's web site - See http://www.ttcautomotive.com for general information.
See http://www.ttcautomotive.com/English/onlineorder/product.asp to download a FREE service manual for T5 or Tremec 3550/TKO
You will need the Adobe Acrobat viewer which is also a free download – http://get.adobe.com/reader/

See http://www.hanlonmotorsports.com/ or http://www.ddperformance.com for parts

A T5 rebuild kit with syncros, bearings and other small parts costs about $160. It does not include any gears or shafts.

http://www.hanlonmotorsports.com/ also has a video on how to rebuild your T5 or Tremec. It costs about $20, and is worth every penny of it.

I did a Tremec 3550 rebuild, and it wasn't that difficult. The video was an immense help, and I would recommend viewing it. At $20, it will give you an opportunity to look and decide for yourself if you think that it is something you want to try to do.

Contact http://www.hanlonmotorsports.com/ or http://www.ddperformance.com for which clutch to use. They will steer you in the correct direction. Both sell clutches, so they may have what you are looking for.