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  1. G

    Changed from Dex III to Dex VI

    Last week I did a 5 qt. cooler line pump out, pan drop and filter change on a LS1/4l60e with great results. After a week of letting the pcm adjust to the new fluid, the car shifts better than it has in years. Even better than new Dex III changes were. Shifts are firm when pushed as they should...
  2. G

    For firmest shifts in GM LS1 4l60e?

    Is is correct to say that a Dexron III/Mercon spec would be better fluid to use than a Multi-Vehicle ATF with Mercon V approval. Wouldn't the friction modifiers in Mercon V and Multi Vehicle Synthetics allow the trans clutches to slip more thus generating more heat, breaking down the fluid...
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