Lockup in 4th to accelerate more smoothly, and still get your gas mileage.
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"Lockin4th Torque Converter"-Lockup clutch 250NM
"Lockin4th HEAVY DUTY Torque Converter" - Lockup clutch 350NM (for supercharger)
Legran Torque Converter Mod 1.0
Smoother acceleration, with nearly the same gas mileage