Get an ATSG Manual $15 or Haynes Manual, video $25-$30. Rebuild kits for the TH350 are cheap. Here's Standard & HP kits. There are a few parts that don't come in the Master kits that you'll need to order seperately like the band, adjustable modulator & filter. Read the 1st link for some Info. I'd get the HP kit with the Red Eagle clutches.
http://www.bulkpart.com/Merchant2/me...Code=Questions
http://www.bulkpart.com/Merchant2/me...e=350-350Ckits
http://www.bulkpart.com/Merchant2/me...350-350CkitsHP