1985 300D hard shift issue.
 

My 300D has rather hard upshifts. Not really like bad tranny, but just more like out of adjustment. It's only with the upshifts, not the downshifts. 1st to 2nd is the roughest, 2nd to 3rd is a little smoother, and finally, 3rd to 4th is rather smooth. The car has 167,000 on the clock, and I just did a filter and fluid change on it just 2k ago with my last oil change. My problem is, I haven't ever messed with this car's tanny and I don't know what to look for or at to adjust. Any help here, would be great! Thanks!

My car is exactly as yours is.