6R80
6R80 6-speed RWD. Mercon LV-only (NOT Mercon V). TCC shudder is the #1 complaint. Solenoid pack replaces as one assembly.
Shop 6R80 Parts10R80
10R80 10-speed. Mercon ULV-only. Tighter assembly tolerances. Bump-engagement issues often resolve with PCM adaptive reset.
Shop 10R80 Parts4R70W / 4R75E
4-speed RWD. Mercon V. Forward drum / reverse clutch are the high-failure items. Classic rebuild, well-stocked aftermarket.
Shop 4R70W / 4R75E Parts