When I got my 73 blazer all forward gears were slipping very badly, but reverse was fine. I put in a used tranny about 3 months ago, every thing was good, untill 2 days ago. I lost reverse gear, no slipping this time,it feels like putting it in nutral. A couple of times when I tried reverse some thing would just clunk, I can't tell if it is the transmission or transfer case. Any thoughts will be gladly accepted. Wille