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03-09-2017, 08:07 PM
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#12 |
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Member
Join Date: Feb 2002
Location: Marion, Ohio
Posts: 183
Likes: 3
Liked 44 Times in 15 Posts
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Re: Dextron III / IV or Synthetic ATF
Dexron HP fluid, which is what GM is now using in the 8 speeds is fully synthetic. Some of the the 8 speeds that were filled with Dex6 are having tcc shudder issues and they are having us flush and refill with the HP fluid. I fixed a very low mileage 17 Canyon with this procedure. The GM part number is 19300536. Mobil 1 also has a version. Stuff is pretty pricey though.
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