I've been struggling with this 1980 1500 Spit for almost a year. What I'm down to is this: after a crank regrind, new rods, mains,and thrust washers timing chain, rear main seal, 3 piece clutch, regrind stepped flywheel, 4 new synchros, trans input shaft seal, trans output trans seal,used but very good shift forks, all appropriate gaskets, I'm left with this: excellent upshifts, clashing downshifts (better with double clutching or just waiting), possible OD slipping but only with OD NOT engaged, under load, and after full depressing of the clutch pedal. Needless to say, lots of $$$ and time and I'm still not there. Car has OD, hardtop needing side lites, custom fully instrumented dash (well done with TR gauges) great seats/carpets, uninstalled poly tunnel, very good body with bright yellow paint, all decals, newish tonneau,new uninstalled bra,excellent top, and hood cover, new tires. Webber carb with header. I'm going to rebuild the clutch master and slave this weekend. If the trans does not improve, I'M DONE. Any buyers out there???