I recently purchased a Scion tC 2006. It has a 5-speed manual transmission. The 5th gear does not stay in unless i hold it with my hands. Often i also need to force it into 2nd and sometimes 1st and reverse. Do i need to do a transmission swap or just fix something with the linkage? If so, does anyone know any place i can purchase a used transmission for $400 or less? Looking to swap it myself instead of paying the ridiculous labor charge for transmission problems...