[19673ontree]

If you will take a pic of the transmission and post it we can tell you for sure but dont sound to me like anything is wrong ,,,,,
#1 you say it is srubbing grinding ? When going from second back to first without stopping that sounds like a normal non syncronized 3spd
#2 gears hang up when shifting from first to second ,,,, sounds like driver habbit just need a little practice ,,,
Most everybody hates the 3 on the tree shifter they say they hang up ? I have drove these trucks with the 3 on the tree since about 1984 and never had a problem my 67 I have now shifts great for me but if anybody else drives it the gears hang up ? Ive been told the shifter is tore up ? Is it ? lol
Anyway post a pic of the transmission I bet its a good ole non syncro 3spd ,,,