Originally Posted by RAYMOND485

1984 300d Turbo 135k
No Down Shifting, And Engine Speed Up 2500 To 3500 Rpm Shift 3-4. Trans Was Slipping. Adjustment Of The Vacuum Control Valve From 15 In To 17 In Vacuum With A Small Hand Vacuum Pump Now It Works Good Downshifting. Up Shifting Is Good Also. Do A New Filter And Atf Before Adjustment. And You See The Adjustment Is Under The 1/2 In. Round Clear Cover Take Off, this Is On The IP. And Remove The Green Dash Pot And Use A Hand Vacuum For 17 In. Vac Pump The Vac Pump Each Time For For Adjustment With Engine Off. If Vacuum Is Low To Trans, You Have To Move VCV By Let Up The Power To Shift And When Sliping Of Trans , Your Filter May Be Plug Up Use Pep Boys New Gallon Atf And They Will Take Back The Old Atf What You Remove Is The Same You Put Back In Only Put 3.5 Qts In Start Engine And Move Gear Shift To All Gears Than Add More Atf 3 Qts Their Is A See Gage On Side Of The New Gallon Atf 6.5 Qts Dip Stick Will Read Low When Cold