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Home >> Chevrolet >> 1990 >> Forward Control 3.9 L >> Repair and Diagnosis >> Transmission >> Manual Trans >> Servicing - M/T >> Lubrication >> Recommended Fluid >> Transmission
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Recommended Fluid: Transmission

The 77mm 5-speed and 89mm 4-speed OD (overdrive) use Dexron-II ATF. The 117mm 4-speed uses API GL5 SAE 80W90 gear lubricant. Manufacturer recommends using Manual Transmission Fluid (1052931) in 85mm 4 & 5-speeds.