Cross referenced that for you mate.
TEXACO ETL 7045 ; PART # 83220002121.
I also got my hands on the original GM rebuild and design drwaings and spec tolerances (savage hard copy book) and it specifies the transmission was designed for Dex 3, specifically an additives supplemented fill which 7045 is. Aparently normal Dex 3 affects the oil cooler, causing it to rot from the inside out.
Anyway Texaco ETL 7045 is the right one for you.