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jerry witzel · 03-09-2017, 08:07 PM

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.

03-09-2017, 08:07 PM	#12
jerry witzel Member Join Date: Feb 2002 Location: Marion, Ohio Posts: 179 Likes: 3 Liked 29 Times in 13 Posts	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. Attached Thumbnails