Hello, I have a '85 300D/123(CA) with turbo that will not shift into 4th gear(auto trans).Fluid level was high,so I removed some and topped off with Trans-X.The vacuum mod. seems to function normally.I unplugged the kick-down switch ,no change.Adjusted bowden cable, still no 4th.Other gears shift just fine and it reverses without hesitation.K2 clutch?Any pearls of wisdom would be appreciated.Thanks.