727 no reverse

My buddy had the same problem.........he removed the tranny pan and a hole was plugged up with crap in some part of the tranny body where the tranny fluid would flow thru. He drilled thru the crap in the hole and out came clean tranny fluid.........this was why he didn't have reverse gear........drop the pan and have a look to see if any holes are plugged up anywhere fluid would flow thru..........hope this might help you out.