Hi seroyen, glad you managed to solve the AL4 jerk problem. Nowadays I did the same as what you did, not to hit the acc to fast especially from standstill going over a slight climb because that's when the thud/jerk will normally happened.
I think I will follow your rectification course by having the car diagnose especially on the GB temp issue. I might encounter the same issue as yours & hopefully hoping of no more than that
407SW AL4 GB - Loud THUD changing from 1st to 2nd gear !!
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