WLTOYS A959B Metal Gearbox Upgrade Parts

WLTOYS A959B Upgrade Parts name:

Metal Gearbox, included Screws;

Random Color: Black, Golden, Silver;

Package list: 1set/Lot;

Only used for the Car model: A959B

About the WLTOYS A959B Drift Racing car, it is 1/18 Scale 4WD, Top speed about 70KM/H (43.5MPH), 540 Power motor, High speed Racing Vehicle.

How to distinguish between A959 (A series) and A959B (B series)? 

1, Different motor models, A959 (A959A) is 390, A959B is 540, There is a corresponding model code on the surface of the motor;

2, Different Speed, A959 (A959A) is about 35KM/H, A959B is about 70KM/H.

(A and B series, most he parts are same, but some parts are not same, so, please check it before Pay.)