So I am sitting here waiting on some old timey 80-90 gear lube (w/GL-4 rating) and looking at the bottle of supplement. This is going in our '67 4 speed with Saf-T-Track differential. The bottle of LS additive says "recommended for manual transmissions". I've never heard of such. Has anyone added this to their transmission? Any noticeable anything as a result? BTW - I have pulled the tranny out to have a synchronizer replaced. Maybe this stuff would help? Although, it was about 45 years ago the last time I had a syncho replaced. I guess one every 50 years or so isn't too bad... Cal
