08 express hard shifting 1-2 only when cold

Tonyv__

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So this just started recently. My 08 express van 50k miles 6.0 engine. Not exactly sure which trans it has. Just started hard shifting when cold. Like first thing in the morning. I warm up my truck then I leave the driveway. 1st shift is hard and sometimes 2nd shift is hard. Then it smooths out and no problems for the remainder of the day. Unless it sits long enough (8 hours or so for example) then it will do the hard shift again

any recommendations on where to look or start would be great. Thanks in advance
 

Tonyrodz

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Might be the solenoids in the trans sticking. Had to replace both of mine in my 4l80.
 

Tonyrodz

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Yes, very similar. I thought the trans was going. I actually had a trans code for it. You'll need a scanner that does trans codes.
 

Tonyv__

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Yes, very similar. I thought the trans was going. I actually had a trans code for it. You'll need a scanner that does trans codes.
I guess I’ll have to spring for that tech2. I really wish it still worked for 2015 as well though
 

Tonyv__

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Cheaped out and bought an Autel scanner last night on Amazon for $99. just can’t justify buying the tech 2 yet. I’ll keep the thread updated as soon as I scan an find anything
 

Tonyv__

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No codes in the transmission…. Hmm. But the fluid is filthy. I can’t believe I haven’t checked that. Gonna start by cycling that out with clean fluid than maybe a filter
 

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