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Im having a shutter from 1st to 2nd gear at WOT in my 5.3 with the 4l60e and i believe i have narrowed it down to the 1-2 shift accumulator.
From what Ive read it seems to be an easy job, i just cant seem to find any write ups on it. So if any body has ever done this before can you explain it? or point me in the right direction to a good write up?
 

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The 1-2 shudder was the beginning of the end for my 4L60E.

$2300 later into a fully built unit and I now know how a "real" transmission should shift.
 

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You drop the pan and they really are right there. I did the a and b servo while I had it apart. Sorry I didn't take pics when I did it. Cold weather, I just go out and do it to get it done.
 
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