The torque converter has leaked down. There should be a small plug that can be removed and you can fill it. First let the transmission run a little bit to fill the converter, then check the level and fill as necessary (the pump is filling the converter). Or you can pull the tranny back and fill the converter that way.
i dont know either i got 350 turbo no forward but have reverce if anyone finds out let me know ....rebuild is about 800.
The typical turbo 350 has three speeds forward and one reverse.
tranny fluid possibly or hydraulic
Automatic Transmission fluid
in your tranny fluid check tube you will need a funnel
in the transmission fluid reservoir under the hood
Under the air conditioning pump, to the right (looking forward from the rear) & slightly below your turbo housing.
usually next to the blinker fluid reservoir unless its turbo then its under the flux compasitor relay unit thingy
The TOTAL capacity of a Turbo 350 is around 9.3 quarts, this is including the converter.
GM synchromesh
2 qts
DOT 4. Is the recommended brake fluid by Audi.