So, I crawled up under the car today. I have a 722.300 transmission. Looking that tranny up I have a 1:1 4th gear. If I am reading that chart right. I have noticed while driving this car that the revs seem rather high when you reach 4th gear. I am, however reaching 4th gear. I tried out some suggestions found on this site. I am really surprised the R.P.M.s are that high in 4th gear. Oh, it is a 85 280SE Grey market.