The new update has a serious bug effecting ALL car transmissions. This bug only happens when you enter the track. All other menus are safe to adjust on. It seems to be the final drive that has the bug. Online seems to be unaffected. Link regarding they have replicated and are aware of the issue: http://www.gran-turismo.com/gb/news/00_5005325.html?t=@gt6game Quick explanation: any car you currently own with a customizable transmission, that has had the final drive gear adjusted will reset the entire transmission to default once you enter a track. As of right now there is no way to adjust transmissions, as every time you enter the track, the transmission gets set to default, or you lose your already... Timed consumed.. Click by click, perfect transmission. Update* Update 1.18 has resolved the issue. Fully customizable transmissons are no longer effected.