So I have a 2003 Grand Prix SE 3.1 v6 with 199,800 miles on it. The transmission shifted very hard and jerked under acceleration from a standstill, forcing me to take my foot off the accelerator. Anyway, I've been trying zMAX gear treatments and cars for years as a preventive measure. There was no damage. So I figured why not try it on this machine and see if it helps. yes it helped I drove 70 miles right after I put it on. It shifts smoothly and squeaks when the tires take off, rather than juddering and letting off the gas. I just saved a lot of money.
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