a904 Front seal leak?

Hey guys so on the freeway last night started smelling some trans fluid. Sure enough it was leaking from the front seal. Now the car shifts perfect , oils not burnt or smells, it has a trans cooler, and a Shift kit.

It leaks when its parked and running its not leaking on start up but once i start driving when its parked i believe its all the trans oil left in the front case leaking through the trans shield.

First Question, can it just be the front seal? why i ask is because a long time i changed a front seal in my 71 darts 904 because it was pissing fluid. And it didnt fix the issue it had a internal pump problem.

Second question
i had a shift kit installed in this transmission can i just swap it into another running one? thanks guys!
Might need a pump bushing and a new seal. If the bushing is badly worn, a new seal still may not seal.