use some of the Mopar black ATF/RTV from the dealer with a new o-ring



drop pan,clean with brake clean,install with ATF/RTV and let cure over night

I change the filter,adjust bands,install newer style gasket from the dealer,torque the pan bolts and let sit over night before refilling it

I also look at any of the other seals that may or may not be leaking and evaluate the need to replace any at that time.I also check the rear servo pivit pin at rear of the case/tail housing(that leak can make you think its the dip tube or something else if over looked)

most times I do the TPV seal,gear selector shaft seal,fill tube o-ring,pan gasket,rear seal,adjust bands all at one time if I plan it right