Just tried it out sadly that didnt fix it 
cpp looks like that:
// Fill out your copyright notice in the Description page of Project Settings.
#include "VehicleMovementClutchComponent.h"
float UVehicleMovementClutchComponent::GetClutchStrength()
{
return TransmissionSetup.ClutchStrength;
}
void UVehicleMovementClutchComponent::SetClutchStrength(float Value)
{
TransmissionSetup.ClutchStrength = Value;
UpdateTransmissionSetup(TransmissionSetup);
}
or did i do something wrong?