Newly acquired 2006 Commander Limited does not shift into 5th until 65 to 70 MPH? Therefore; I run about 2000rpm at 60 (in 4th) & 70mph is 2000rpm (in 5th). Am getting 15 mpg. Just got Superchips FlashPaq 3872, but before I use it, should I have reflash @ dealer?? Jeep has 100K on it.
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