4L80e doesn't downshift sometimes

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RDF1

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We had this happen on a Transam we put a 4L80E in.
It ended up being a valve in the valve body was sticking. Initail start we had all gears. Once transmission was warm, we would not be able to get it back into first gear. He had 2nd gear starts and everything else worked fine.

Took the valves out and used some scotchbrite pads on them to clean everything up and no more problems.
 

Supercharged111

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Pressure control solenoid can cause 2nd gear starts as well. The 4L60 and 4L80 use the same part here. I forget if it only applies to the 60 for 2nd gear starts though.
 
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