Sorry for the late update..been busy with work.
David, its the driver side engine mounting. The rubber in the center of the mounting degraded prematurely this has cause the engine at driver side to drop a bit and the drive shaft coupling will hit the lower arm under even normal acceleration.
It happen when I downshift to accelerate. Since then every time i try to accelerate in any gear the drive shaft coupling will hit the right lower arm...I had to drive like pussy
until I reach my mechanic workshop at Sunway Batu Caves from my home. He checked and confirm the driver side engine mounting is the culprit. I asked him to check the other two mounting but he says both still ok. So he replace the drive side engine mounting with the standard mounting and problem solved.
My guess is that under frequent low gear hard acceleration
the driver side engine mounting will not last. I have yet to alert vibra about this and will do soon.
So please be careful guys. The best and safest way is to change back to the standard mounting. (only for driver side engine mounting)
"Knowing is not enough if you don't apply it. Willing to do is not enough if you don't do it".
(quotes by the late Bruce Lee)
"drivers aid and safety gadgets only minimize injuries and damages, not to cheat death"
(quotes by me hehe)