I have a th350 paired with a np205, i think i may have transmission fluid leaking into my transfer case, i have been told i need to pull the tranny and transfer case out of the vehicle to repair this. what is the seal called that i need to replace if i do indeed have a leak between tranny and transfer case? also i am just wondering what the general concecous is re the th350 and np205 as a pair? is it worth replacing the th350 with a th400 while i have everything out? thanks in advance for any comments, you guys always have good insight.