I have a "hangup" with the description of this too, F150 Man 4Eva, so you're not alone.
What Cody was telling you is absolutely correct. The TSS will equal the OSS in 3rd gear only provided the TC is locked up. In any other configuration, they will always be different. I find the difference being labeled "slippage" as totally misleading - which can lead to unnecessary worry.
- Jack
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2014 F150 Platinum SCrew 3.5L EcoBoost 4x4 with SCT programmer
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