2000 Chevy ECSB 5.3 4l60e 4x4 3.73 154K bone stock & original.

It only happens when you come to a hill and the pickup downshifts to third. Once it downshifts it does this short lived shutter (1-5 seconds) then it seems to go away. My first guess was misfire, but with no codes present or in history and the conditions when it happens is making it hard to pin down.

Had a trans shop take a look and they said the torque convertor was the most likely culprit. I drained the pan and found metallic flakes in the fluid. So the trans shop did a rebuild on the trans, new converter, electronics & updates, but they did not find anything out of place in the trans so they assumed it was in the converter. Well......the problem is still there.

Might belong in anther section

 

should be in gm drivetrain and suspension, but its cool

 

I was in thread I posted to then started a new thread without thinking about where I was!

 

are u throwing a code for tq convertor shutter? n if it aint right after all u had done id go back and complain...somethin aint right