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4L80 loose when cold, tight when warm

J

Jerm

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Location
Wichita, Ks
A buddy of mine has an SS Trailblazer with the 4L80. When it’s cold it’s like it has a stall and runs up around 2500 rpm as he accelerates. Once it warms up, he can’t hardly hold it at a red light with the foot brake. It wants to push through the intersection. What do you think?
 
Did he swap the 4l80e into it? Stock they came with a 4l70e. Is it throwing codes? How many miles? Has it been limped? Any power adders on it?
 
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