Originally Posted by 1995boss
I look to see what transmission fluid I need to use. I hear automation and can be synthetic 80 to 90 weight. Also if I can use automatic tranny fluid can I use auto tranny fluid treatment?
I'd go by what the book says or look up the numbers on your transmission tag to find out what is recommended.
Some use automatic transmission fluid and others use gear oil (75-90 wt.)
You never want to mix or confuse the two as it would result in the destruction of your transmission.
For manual transmissions that use the automatic trans fluid I have read that the best fluid to use is the GM Synchromesh fluid, but check that out for yourself before deciding to use it.