my '80 300TD has been shifting really hard (it's worse when the engine's cold).
i don't suspect the transmission, because the previous owner told me he had it rebuilt recently, and when i recently changed the transmission fluid, everything was beautiful (no burnt fluid, no metal flakes, etc.)
i complained to a mechanic about the car shifting late and hard, and he told me to adjust the modulator until the car was shifting at the shift intervals marked on the speedometer, which i did.
HOWEVER, the car is still shifting hard, so the same mechanic has suggested that it must be a vacuum problem, and that the brake booster hose which supplies vacuum to the shifting mechanism is probably pulling too much vacuum.
does anyone know how much vacuum it should be pulling, and if there's anyway to know if the booster hose is the culprit, short of buying a new hose assembly for $75? thanks!
Lee