I recently purchased a '83 300CD for dirt cheap, and drove it from Dallas to Austin and back. I noticed that there's a slight flair from 1st to 2nd, and sometimes from 2nd to 3rd. It also takes a second a or two to drop into reverse. What should i inspect/replace first? B2 piston?
As far as the flaring problem goes, check the vacuum switches on top of the valve cover. There's one that softens the shifts at idle (for downshifts as you coast to a stop) and when its lever arm wears through, it softens *all* the shifts. Partial-throttle upshifts got noticably firmer when I fixed this on my '83 300D.