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Engine Braking Strangeness - fluttering / jerking while descending

outdoorCO

TRD Pro
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2025 TRD PRO
Hello
Was descending down a steep mountain pass for extended period, forced truck into 4th gear, was getting very strange “fluttering” “jerking” while descending. It was like the truck wanted to shift even though put in S4, you could really feel it like it was very confused. Anyone else experience this?

On way home going other direction tried leaving it in drive. I would feel the same experience, usually around 45-55 mph, not sure what gear it was in since it was in drive.
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