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6R80 = Mercon LV. NOT Mercon V.
When to use: Mercon LV mandatory.
Wrong-fluid consequence: Wrong fluid causes TCC shudder within 5K miles.
10R80 = Mercon ULV.
When to use: Mercon ULV mandatory.
Wrong-fluid consequence: Backwards-compatible to Mercon LV in some apps. Check manual.
4L60E = Dexron VI.
When to use: Standard GM RWD 4-speed.
Wrong-fluid consequence: Dexron III replacement OK (Dexron VI supersedes it).
6L80 = Dexron VI.
When to use: Standard GM 6-speed.
Wrong-fluid consequence: Some 2015+ 6L80s take Dexron HP - check VIN.
Allison 1000 = TES-668.
When to use: Allison-spec only.
Wrong-fluid consequence: Generic Dexron voids the rebuild.
6L80 = Dexron VI.
When to use: 5th-gen V8.
Wrong-fluid consequence: Standard 6L80 spec.
8L90 = Dexron HP ONLY.
When to use: Friction-sensitive.
Wrong-fluid consequence: Dexron VI causes IMMEDIATE shudder in 8L90.
48RE = ATF+4.
When to use: Standard Chrysler spec.
Wrong-fluid consequence: Dexron in a 48RE = slip + shudder.
68RFE = ATF+4. Aisin variants = AW-1.
When to use: Check trim - standard vs Aisin.
Wrong-fluid consequence: ATF+4 in Aisin (or vice versa) = warranty void.
6R80 = Mercon LV.
When to use: Same as F-150 6R80 spec.
Wrong-fluid consequence: Wrong fluid causes TCC shudder.
10R80 = Mercon ULV.
When to use: Same as F-150 10R80 spec.
Wrong-fluid consequence: Check manual for backwards compatibility.