& try change all ball bearing !!
If left side bearing was broke , you maybe have feel left side turn easy to turn , but hard to turn right side ,
& In straight road fast push up maybe flash to left side .
sterring parts is feel ?
& change SUS. Arm parts la !
same have many case in Sus. arm ,
if use left side is old , right side is new ,
your left side wheel base ≠ right side
Servo :
do you have big touch ( broke ) your car ?
or servo used how many time ?
you can test your servo , open case see gear ,
or move your front wheel left to right , u can check servo gear noise & the inside motor maybe be lose brush or magnet.
or servo saver not balance
last if for race all change new one , after race use for fun !
So sorry i'm no english !
do you understand ?
hope can help you !