I bought this car about 18 months ago with 106,000. It was pretty hard to get it to shift into first and second gears(meaning I really have to push hard to force it into gear). I drained the fluid and replaced with Amsoil ATF and within a mile all shifting had improved 100%. Now I'm at 142,000 and it is getting hard to shift into first and second. I drained and refilled with Amsoil ATF last week and there has been no improvement. Any ideas what is causing this? The clutch seems to still work great.