On the RH side of the transmission case, you will find the Left/Right detent spring. This is the ONLY location where the BLACK SPRING should be installed. It is specifically made to go in this location. Find the only BLACK spring and install it here. This will increase the stiffness when you move the shift lever LEFT-RIGHT.

On the LH side of the transmission case, you will find the Front/Back detent spring located directly across from the L/R spring. This spring controls the stiffness when moving the shift lever forward or backward. Meaning this will increase the stiffness while shifting into ALL gears. You can install any of the remaining springs in this location.