my p38 dse manual is giving trouble going into 4th gear its like trying to pull the gearstick through a wall its not too bad cold but very bad when hot 3rd gear is also bad but not as bad as 4th i did notice metal filings in the gearbox oil about 6mts ago . the gearbox is a gearbox i got out of a scrap vehicle last year and has always had the problem. any advice would be welcome ...sean.