Tranny cooler question

[GS608]

I'm making up my own adjustable shift kit and plan on installing it today, but the cooler in my rad has collapsed as there were brass fillings in the tranny filter when i got it flushed a week or two ago, I plan on getting a Davies Craig from SCA next friday and installing it then, would it be alright to use the shift kit in the mean time or should i really wait till i bypass the rad?