48re 2-3 shift hangs when cold

[Grudgeguy]

Looking at buying an 06 next week, trans has 50k on it and he told me that when the trans is still cold it shifts slow from 2-3 like it tries to hold 2nd.
Is this an electronic issue? What can I do and what's involved? Plan to build the trans down the road but I need it to get me there. I'm totally new to CR trucks so looking for any help.
Note when warm trans acts totally fine

 

[Grudgeguy]

Also what years of the 48re are compatible? Same kick down and electronics as an 06? Thanks CompD!

 

[cummins939]

A little shift delay is pretty common when cold but I'm not sure how much delay were talking about. Also, what kind of shift are you feeling ? Positive? Feel like someone is tapping the brakes putting you forward in the seat? Slipping-long drawn out shift?