Giving Up?

I believe my 4 year trial by fire of changing over my automatic Dart to a Manual is close to over. For 4 yrs now I have run onto several problems. Severe chatter, which I solved with pinion angle shims and clatracs, to a last season experiencing reverse grinding and impossible 1st gear engagement. I switched to a RAM 3 finger this year. Same problem. Adjusted clutch to 60 thousands release. When warm same issue. All new linkage and rebuilt transmission. Could the stock bellhousing be doing this? Man I hate to do this but I may switch to an automatic. Please help.