Regardless you're going to put the vehicle in limp mode when you shift into 4-low. Unless the programming becomes available (its not now) you'd need QDII or QTII if you want 4 low capabilities.

Theres a long thread on here where myself and another member were trying to think of ways to trick the computer so his NV245 swap would work. He did the swap and could shift into 4 low, but the computer puts the trans in limp mode after he starts moving.