I have a 1982 Blazer, 6.2 diesel, with a 1986 700r4 (4l60). I have no reverse. Makes no clicking noises, has ALL forward gears,reverse does not try. I pulled it and took it apart to the sunshell, clutch packs look great, sunshell is solid. I am at a loss! Read something about a check ball not working right, I need to find a good schematic. Any ideas?? Thanks!