Did you change your speedo gear to account for your larger than stock tires? Your tranny uses info gained from the speedo gear for shift points. Also, how many miles on the tranny and when was the last time that you changed the tranny filter? Are you still running your stock gear ratio? If so, what ratio do you have? If you have a 4.0 than you more than likely have 3.73s, but it could be 3.55s. Incorrect gearing will also have the effect you are experiencing.
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