Transmission whine.....Seafoam??

[bc toy]

My transmission in my 97 auto is really starting to whine pretty bad.....especially when cold. I just returned from a trip pulling my tent trailer to the Oregon Coast (beautiful)
It has had a bit of a whine for a while....but now seems louder. It shifts perfect.....doesn't slip....has a tranny cooler.....just the annoying whine!
I have another road trip coming up in a couple weeks.....about 1500 miles.
Should I buy roadside assurance, lol?
I'm thinking of seafoaming the tranny.....anyone have any luck with it?

 

[PitbullRescuer]

Sure it's the trans and not the pinion bearing?

 

[bc toy]

Sure it's the trans and not the pinion bearing?

The whine only happens in gear.
I can hear the whine in gear, while stopped with the emergency brake on. Noise seems to be coming from transmission area.

 

[LittleCaesar]

Torque converter possibly.