I have a 2002 corolla 1500cc AT VVT-I, long story short. My gearbox siezed working and I replaced it wit a second hand one. The new bearbox does not seem to have power and it is struggling to get above 165Km/h. There are moment when accelarating that it jerks violently almost like its failing to select overdrive. Basically it goes down to third and fourth and third again. We have checked all the sensors, is there somethin that I might be missing that needs to be adjusted. Computer diagnosis does not register errors
The jerking and the third and fourt gear change also happens when accelarating from 60 - 120km/hr. This is a 1NZ-FE engine assembled in Singapore. The other thing is that I changed the head lamps and add 90-100w crystal lights and I am using 15amps fuses is that ok.
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