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Torque converter issue?


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Okay so the truck is a 2006 Silverado 4.8lt with a 4l60e. Sunday after filling up at about 45 to 50 mph the truck started bucking. Check my scan tool live data and had misfires on all cylinders at different times and different cylinders while the problem occured.

No misfire codes stored. Had a knock sensor code since i got the truck that was the only code.

What I replaced:

Both knock sensors with harness

New intake gasket

Plugs and wires (replaced last summer too)

New fuel line (rusted bad)

 

Tried dry gas in the tank thinking i bought bad gas (still in there)

 

No codes stored (havnt check trans codes yet)

 

It bucks at about 40 to 50 at a steady speed. I dont know much about transmissions but i assume its when the tc engages? I has a history of shifting hard and clunking.

 

What gets me is why are there live data misses when it bucks but no codes?

 

The bucking goes away if i give more gas or decel. Fuel trims seem normal. Starts right up every time.

 

Also there is a whinning noise that is in line with the rpms also at idle thought it was idler pully replaced but still there. Maybe alternator?post-173184-0-93181800-1495723173_thumb.pngpost-173184-0-28015100-1495723132_thumb.png

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As far as the whining im wondering if a trans will whine at idle? Sounds like a ford ps pump just not as loud

 

*Edit* added screen shots of the tc slip speed and a few misfires i caught.

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