GL4 transmission oil

Discussion in 'General Chevy & GMC Pickups Talk' started by Jeff Cherney, Jun 28, 2021.

  1. Jeff Cherney

    Jeff Cherney Member

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    Ok, I have a 46 Chevy 1/2 ton pickup 4 sp tranny.
    I’m changing the transmission oil and have been told to use Gl4 80w90 oil that doesn’t contain sulfur and phosphorus, and not Gl5 because it will damage bronze and copper. The problem is I can’t find GL4 anywhere, tried all the parts stores. What I do find is some that are for GL4 and GL5 applications. My concern is does this contain sulfur and phosphorus? It doesn’t list ingredients on the bottle. Anybody know if this will be safe for my 46 transmission?
     
  2. Bill Hanlon

    Bill Hanlon Member

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    I bought my last bottle of GL-4 at Walmart about a year ago.
     
  3. Jeff Cherney

    Jeff Cherney Member

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    Hi Bill, unfortunately they no longer carry it. I did find StaLube GL4 on Amazon for $18 a quart.
     
  4. Bill Hanlon

    Bill Hanlon Member

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  5. Jeff Cherney

    Jeff Cherney Member

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