Trans shift/ slip on steep hill less than 5mph.

Any one else have their trans downshift/slip on a steep hill. It almost feels like the torque convertor is locking up/ unlocking. it doesn't seem to happen if I run it in 4th gear. this normally happens only on a steep hill going less than 5mph. If I let off the gas then press the gas again it down shifts or hesitates as if it is downshifting or something.

I don't think it is slipping. As it never has any other issues other than shifting a little hard on cold weather for the first few miles. Doesn't slip when you drive it hard. I've even pulled heavy loads and it seems fine.