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While the shudder is happening, lightly depress the brake pedal while keeping your other foot on the gas with the same amount of pressure that you used to cause the shudder to occur. If you notice the shudder stop and see the engine rpms increase then you know that the torque converter has...

Torque converter shudder is also described as driving over a washboard so it’s very possible that is your issue.

If the transmission tech is unable to find anything else wrong with your truck you could suggest that he monitor the converter slip speed when the bucking/surging occurs. If the converter clutch is the issue you should see the slip speed rpms fluctuate by 100+ rpms and the converter clutch...

From what the OP is describing it sounds like his problem is torque converter shudder. He didn’t say what the mileage was on his truck but I’ve seen this very same issue on fairly low mileage Honda’s with 5 and 6 speed autos and GMs with the 8L series automatic. It’s also described as driving...