My Corolla GLI 4 Speed Auto 2018 model is now 25560 kms driven. Since last year i’m facing the problem in it’s gear on high RPMs. Car runs smoothly in city travel where RPMs are relatively low but when on Highways, the car jerks very badly when the gear shifts to low gear on acceleration.

I’ve tried changing gear oil and gear oil filter and also checked if the mountings are ok. What further could be done to resolve this issue?

Hey I have a AE93 corolla I've recently done a service to it that includes, (oil filter, fuel filter, spark plugs, dropping the oil flushing the old oil out and refilling it with new oil, Cleaning the throttle body with Carby clean) once I did all that I went for a night drive and as i was coming back home the car made a small thud noise then there was no response to the accelerator as I lost speed, I got it back home and went to diagnose the problem but no luck the car still is turning over just no spark I've pulled the rocket cover to see if it just stripped a gear but the distributor is strait connected to the cam shaft were unsure on what it could be were expecting it to be the coil in the distributor unless you guys know anything else it could be, cheers