I lost 4th completely in my 1971 911S with the 911 pull clutch 901 transaxle.
New shift rod guide bushings and a coupler adjustment made it slide nice and smooth into 4th. 
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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