I'll mention one item here;
Most transbrake transmission operates at higher main line pressures since it is a racing tranny.
Higher pressures mean more wear on the pump and more heat is developed.
I would not suggest a trans brake transmission for street use.
Which transmission with a transbrake are you thinking of installing?
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.