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Thread: Manual transmission fluid for 1987 Chevy v20 6.2L Diesel with 4WD

  1. #1

    Default Manual transmission fluid for 1987 Chevy v20 6.2L Diesel with 4WD

    Have a 1987 Chevy v20 with the 6.2L Diesel and 4WD and manual 4-speed transmission. Recently had the transmission fluid flushed and re-filled. Ever since it has been shifting very roughly. Mechanic used 75W-90 Full Synthetic. Indicated it would take awhile to break in but curious if that’s the right fluid for this transmission? Also, noticed that the fluid in the hydraulic clutch reservoir is quite brown so thinking I need to flush that and put new DOT3 in as well.

    Anyone know what is best transmission fluid to use on this truck? I seem to find everything from AT fluid like Dexron II or III but also have seen full synthetic 75-90 suggested.

    Welcome any insight.


  2. #2
    Join Date
    Feb 2000


    Your truck has the SM-465 manual 4-speed transmission.

    The recommended lube is 85W-90 GL-4 rated lube, ~ 4 quarts per drain/fill if I remember correctly. If you live where it gets really cold, most use synthetic lube. If cold isn't a problem, I'd stick with what came in it from the factory - just a high quality non synthetic, mostly for oil seal compatibility.

    Welcome to the board!

  3. #3
    Join Date
    Dec 2005
    Klamath falls/keno Oregon


    same as your engine uses
    06 1ton 4X4 duramax/6speed WT
    Hummer wheels :^)
    dual lift pump
    Banks air intake

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