Bought a used 2004R from a junkyard, guy told me the tranny worked. I pulled the pan and everything thing looked real clean, no burnt fluid, no trash in the pan. Anyways, went ahead and put a B&M shift improver kit in tranny and mounted tranny in my vehicle. I fill the tranny up and try and put my vehicle in reverse, nothing happens. I put tranny in drive and hear quiet whinning or buzzing. I do remember having problems mounting Pressure regulator spring included in the shift kit, boost valve would stick in bore, would this keep the tranny from shiffting at all? I don't remember havng a clearance problem when I mounted convertor bolts to flex plate. Any suggestions?