OK so I've gone through 3 th400's now in my 89 toyota pickup with a 350hp SBC and Th400. The trans has new clutches and steel, tci manual valve body, and a 32 sprag. All 3 have started whinning really bad and when torn apart the plantary gears are killed and have lots of play in them, and the last trans spun the rear case bushing and the thrust washer broke into 3 pieces. Any ideas on what to do or any ways to keep it alive. It's a stock fixed yoke tailhousing, doesn't have any bind or plunge issue, would a roller bearing tailhousing help this situation. Thanks.