GFB Short Shift Kit for MY97-07 WRX 5-speed (part 4001) - Manual (Page 2)

2. Using the 12mm spanner and shifter, undo and remove the bolt
that holds the linkage to the shift stick.
3.
Remove the factory shift stick by levering the ball out of the
socket. Simply push the top of the stick towards the back of the
car until it pops out (figure 3).
Figure 3
4a) IMPORTANT: The linkage knuckle is designed to fit the two different diameter shafts that are found
in different models and as such, it comes with two
different length pairs of screws. For all MY00 and
earlier models (16mm diameter shaft), use the shorter
pair of screws (M4 x 8), and for all later models
(19mm diameter shaft), use the longer pair (M4 x 12).
Also note that a small handful of US MY02 models
came with the earlier shift mechanism, in which case
simply refer to the notes regarding early models.
b) Fit the two parts around the linkage with the long side
facing up (figure 4).
c) Place the two correct length M4 screws into the holes
and screw them in until there is no slack, making sure
there is an equal gap between both sides of the two
parts.
Figure 4
d) Now loosen the left screw just enough to allow the knuckle to be rotated horizontal (so that the two ends
of the knuckle are parallel to the sides of the shift linkage), but DO NOT tighten it back up just yet.
5. Fix the two side plates to the linkage by first
inserting an M8 screw through the plate and
then through the hole in the linkage fork.
Thread an M8 nut partially on, but DO NOT
tighten yet. Repeat on both sides (figure 5).
6. On both side plates, insert an M5 screw
through the matching 5mm hole and thread it
into the linkage knuckle. Now tighten all
screws and nuts. As long as the lower M4
screw on the linkage knuckle was set to the
right distance as per step 4c, you should only
have to tighten the top screw to clamp it tight.
Figure 5