A833 fluid

I use Pennzoil Syncromesh transmission oil in mine.
Good stuff.
I got it at Napa.
You must use a GL-4 oil or Dexron 2 ATF.
Do not use synthetic (if the transmission is stock), it is too slippery and will cause gear clashing from my experience, and it's too bad because I am a firm believer in using synthetic oils for most things..........