Luckily I'm on my semester break. So I'll have lots of time looking to repair it.
So I went to Mat Jey's and as usual jack the car up and place it on a stand.
I took some photos of the under carrage rusts are everywhere !




I went to my friend's apartment and he showed me he had twin intake Weber DCNF for toyota K-Series engine, and its not for sale. dammit.

Draining Gearbox oil before taking out the gearbox

After removing the screws and mounting the gearbox is out



Gearbox operation starts


There's ball bearings inside it, carefull you'd dont want to lose it.


Disassembling SynchoGear and cleaning parts




Change to new bearings

Reassemble Synchro gear and parts





And finally please be careful if you are handling Engine parts or gearbox parts, because the edges are sharp as knife. and i did learned my lesson because my gearbox cut my thumb. it was deep.

after the bearing change my gearbox works perfectly. the problem rises is mainly caused by low level of gearbox lubricant. im gonna check for my gearbox lube often after this.