Transmission Service, to perform or not?
#11
Senior Member
Based on clutch technology at the time you are probably best to rely on the material suspended in the current old fluid (regardless of color) versus risking new fluid that does not contain an additive package capable of transferring power between worn clutches resulting in slippage. The film of worn fluid between the clutches is most likely what is actually transferring power between the clutches.
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2016FordF150 (01-28-2019)