The old Type A -transmission oil has undergone numerous improvements over the years, and is now known as DexronAutomatic Transmission Fluid (ATF).
The original Dexron oil became Dexron II, which developed into Dexron IIE in the early 1990's. Dexron IIE used extra additives that helped clean computer-controlled shift solenoids and pressure control solenoids inside the transmission. After only a short time, Dexron IIE became Dexron III, which is still the current Dexron designation.
Dexron III can normally be substituted for any of its earlier relatives
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