2014 Silverado 1500, 6.0L, 6L80E. 112,000 miles. Customer complaint: shudder at 45–55 mph under light throttle, especially on warm days. Previous shop had already told him it was the torque converter and quoted $1,800 for R&R plus a remanufactured converter. First thing I did was connect a scanner and watch TCC slip speed during the shudder event. At 50 mph, light throttle, TCC commanded on — slip speed was reading 180–220 RPM. That's not a locked converter. But before condemning the converter, I looked at TFT: 238°F. That's high for highway cruise on a mild day with no towing. Not in shutdown range, but elevated.
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Lubegard 60902 Automatic Transmission Fluid Protectant (Red)
10% volume addition restores TCC apply friction on worn converter clutch surfaces — fixes shudder without converter replacement in many cases.
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