I replaced the tailgate cable on the driver's side today with part number 68488335AA from the TSB. Holding the cables next to each other they appear pretty close to identical. Once installed, there is still slack, but not as much. When I put weight on the tailgate the slack is gone. With the old cable, the slack was always there even with weight on the tailgate.
So it is an improvement, but not perfect. Seems to be functioning as designed based on the above quote.
So it is an improvement, but not perfect. Seems to be functioning as designed based on the above quote.