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4l80e steve 5-14-11  
Hi my trans shift great at cold but when i drive like 30 minutes i lost the first gear all time ???? can you help me please
Re: 4l80e BUBBA THE BUS TECH 5-16-11  
4L80E is a computer controled unit, this means you will have to start by seeing if the computer sees a prroblem.
Some later computers will see shorted or disconected solinoids and the like as well as tell you what component has failed inside the transmission.
2nd you will need to take the oil pan down and look for signs of failure.
But in long run it sounds to me as if you have a seal failure inside the transmision and it will need to be dissasembled to repair and for the extra few hundred $ probably a rebuild is in order.
Good Luck
Re: 4l80e jafar koot 8-27-11  
When transmission reaches 110 to 125 degrees it shifts very hard.You can stop for a few minutes and it will shift fine for a few miles then it starts to shift hard again. This is a 2000 GMC 4x4 with 59,000 miles. 2500 seris.
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