Need 4-speed Help

Need some help w/my 833 4-speed. Bought from a local sawp meet and installed as was. Adjusted clutch shifter rods and fork linakge several times and appears to go into all gears, 1-4 & R. When clutch is let out, car rolls either forward or back slowly. Under load, there's a high pitched squealing and car doesn't move. Planning to yank and begin trouble shooting and don't have much knowledeg of 4-speeds. Any advice?