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The 1991 Chevrolet 1500 Series light truck was built in 5 engine options between a 4.3 V6, and 5.0,5,7,6.2 and 7.4L V8s. The 5-speed manual transmissions having code 'SM465/'M20", "5ML60/YM2" are all specified for API 'GLS' gear lubricants . General Motors' Synchromesh fluid is also compatible and specific to these applications.

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Q: What kind of transmission oil does my 91 Chevy 1500 5 speed take.?
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