You need to check the transmission fluid first , see if its low ,note color and smell to see
if if looks burned, dark fluid indicates old fluid/worn parts.
usually when the transmission slip only when cold , the seals are worn internally , thats why
it works ater it gets warmer , the heat expands the seals.
you can try a transmission additive (stop leak) but i dont recomend it , it softens and expands the
seals , the best answer is to rebuild , which is expensive .
depending on the vechicles condition ect, you might consider driving it till its done and
getting something else
sorry , best of luck

