flaring is when the engine rpm increases due to the clutch pack within the transmission is not engaging and slipping, the thud is due to poor or incorrect clutch pack clearances due to ware. During flaring loss of drive is experienced.
misaligned throttle pressure cable for the transmissions will also cause the thud on upshift between first and second
low fluid can also cause flaring if the torque converter cannot couple
Originally Posted by ECU-MAN
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