I need some serious help. my AOD went out in my 90 gt so I installed a c4 that I bought from a private party. I did every thing by the book but it still wont go into gear. the only thing I didn't change was the flywheel and torque converter. the c4 bolted right up with no problems. I changed the filter, filled with plenty of fluid, and removed one of the cooling lines to see if the pump was working. it still wont go into any gear. the shift lever moves but does not engage. what do I do now