As MexicanPT stated, that is common for all four-speed automatics with lock-up torque converters. When the torque converter locks and unlocks it almost feels as if there was a gear change as the rpms will rise as the torque converter unlocks even though you are still in the same gear. The torque converter performs the same function as slipping the clutch on a manual transmission to get the vehicle moving. Until the torque converter locks up, it is like constantly riding the clutch. Once the torque converter locks up you are then using the exact gear ratio that is stated in the literature, until then you are at an effectively between gear ratios.
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2003 Almond GT AutoStick, body colored rear splash guards and hood struts, chrome gear shift, AC & vent knobs, billet steering wheel spokes and pedals, AMX1397 Turbo-Intake Pipe.
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