So I have a blown 4r70w on my 2000 gt and I bought a 2004 4r75e with supposedly 40k miles on it. I am almost done installing it and got to the point where i put the driveshaft in, So I decided to turn the driveshaft while tranny is in neutral (3 clicks from Left to Right) and driveshaft does not want to turn, I have tried to put the manual lever in all positions and still no turning of driveshaft. Am I missing something here? I did by another 4r70w with higher miles which is sitting on the table and decided to put the driveshaft in and it spins with no issues. I feel like the 4r75e is toast.