Many transmissions do that because the torque converter clutch is undersized (for cost reasons). If you shift kit the transmission, and can bump up the engagement pressure, you'll be less likely to slip it under heavier loads, so it's safe to lock up with more throttle (not at WOT, but that's not an issue here).
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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