Question about Chevrolet Silverado 2500HD

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Fluid change in a standard transmission on a 1998 chevy k2500

I posted this earlier but wanted to add more input. The transmission doesn't seem to have a drain plug although there are 2 plates approx:3x4 inches one on each side.I don't know if this where I should drain the old fluid,will something fall out if I remove a plate? Years ago standard trans. had both a drain plug and a fill plug. I do know I need to use a synthetic fluid in it.Anyone who knows about this please help.

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Under normal driving the fluid never needs to be changed except if it is being serviced for a problem. It should use Dexron VI fluid.

Posted on Mar 25, 2014

Testimonial: "There are only three types of fluid that are OK to use as far as I could find.The label on the transmission says to only use Castrol Synthetic,GM makes its own,and there was one other I found but don't remember what it was right now.I have it written down somewhere.But,Dexron VI was not."

  • 5 more comments 
  • yadayada
    yadayada Mar 25, 2014

    I show it uses 5W-30 synthetic manual transmission fluid. The brand is unimportant as long as it is what I just wrote.

  • Thomas Bice
    Thomas Bice Mar 25, 2014

    I checked,as best I could, what you said about using 5w-30 synthetic fluid but I was not able to confirn it. From what I found you are currect if the transmission is a NV3500 but I have a NV4500 transmission. The 4500 was not listed when I checked on line. Is it the same for this transmission or do I need a heavier rated fluid for it?

  • yadayada
    yadayada Mar 25, 2014

    Do not use a heavier fluid. It will increase shifting effort and possibly damage the syncro cones

  • yadayada
    yadayada Mar 25, 2014

    Here is a novel idea check with the dealer or a parts house like NAPA.

  • Thomas Bice
    Thomas Bice Mar 25, 2014

    Mr. Weid,

  • Thomas Bice
    Thomas Bice Mar 25, 2014

    Add a CommentI bow to your expertise in knowing which fluid to use in my transmission. Thank you. However, mymain question was about changing the fluid. My transmission does not have a drain plug, what it does have is 2 3x4 inch plates (one on each side). My main question was whether I should remove one of them to drain the old fluid or am I missing something? I just don\'t want to make a mistake that will come back. It has been many years since I did anything with a manual transmission and the old ones used to have a drain plug. I\'m talking the 60\'s here. As to your comment about checking a dealer, I did. That\'s who told me about the type of fluid to use, but they didn\'t tell anything about what weight the fluid should be so I thank you again for that.

  • yadayada
    yadayada Mar 25, 2014

    Yes remove the paltes or covers, Make sure if they are no gasketed tyhen they use a sealer called "Anaerobic" made by Loctite and Permatex. It is very expensive as is the fluid.

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