|[Click on Photo]
||This article describes the installation of the kit in Bob
Tindels 1983 911SC (type 915 transmission).
As much as I have enjoyed the two 911s
I have owned, neither one shifted like I thought a true sports car should. Even with
replacement of all the bushings in the shift linkage, the shift throws were still long,
vague and imprecise. In my current 1983 911SC, the shift from second to third was
sometimes balky. The factory short shift kit was the answer to all my complaints. My only
regret is that I didnt install it sooner.
The best thing about this short shift kit compared to others is that it was designed
and engineered by the factory as an option (M241) that could be specified when the car was
ordered, or installed later if desired. One of the reasons Porsche encouraged the use of
the short shift kit was that it provides additional room for moving the seat further
forward for shorter drivers. It was also recommended for the sporting driver.
The factory design takes a different approach than aftermarket short shift kits, as
shown by the greater number of parts in this kit, and by the quality of the parts. Just
one of the superior design features of the factory kit is that while it reduces the length
of the throw to shift gears, it maintains the lateral spacing of the gears in the shift
pattern — the side-to-side motion is reduced by only a small amount. This makes it more
unlikely that you will select the wrong gear.
Keep in mind that the laws of physics are still in force, and that when we reduce the
movement required to shift gears, the shifting effort goes up a little bit. However, the
short shift kit will make shifting seem quicker because the throw is shortened. I
didnt find the slight increase in shifting effort significant.
Clockwise from the top left, Figure 1 shows a new shift rod bushing and shift lever
ball cup bushing. Both of these are inexpensive and should be replaced. If these bushings
are even slightly worn or tired, it will induce sloppiness into the shift linkage.
Following the bushings in Figure 1 are the parts included in the
factory kit: the lock pawl plate, shift pivot housing, stop plate, shifter pivot pin,
springs, shifter guide plate, and shift lever. In the improved design, the shift lever and
the shift pivot housing are modified, with a raised pivot point. Figure 1a shows the new
shift lever at the top, and the new shift pivot housing at the left.
To begin the installation, remove the console. Start by removing the cover at the front
end of the console, which is retained by four screws (Figure 2
and Figure 3). Next, remove the trim piece inside the console
opening, by removing the two screws on the left outside of the console (Figure 4). Remove the knobs from the air conditioner temperature
and fan controls, and remove the retaining nuts for these two units. Take out the two
screws on each side of the console, and pull down the AC control panel. Push the two AC
control units through the hole in the front of the console, and unplug the stereo fader
unit wiring at the white multi-pin plug (Figure 5). Take out the
screws that hold the bottom of the console to the tunnel. There are two in the front, and
one hidden under the carpet in the rear. Remove the console from the car by rotating and
pulling it up.
Remove the passenger side footboard, pull the carpet up over the shift lever, and fold
it back (Figure 6). The 22mm locknut for the set screw on the
front of the shifter housing must be loosened. On my car, it was fairly tight, so this is
a good time to break it loose (Figure 7). There are five
allen-head screws in the base of the shift tower, three which hold the tower (6mm
allen-head), and two which hold the shift rod bushing bracket (5mm allen-head) Take out
all five of these screws, pull the shift tower straight up, and remove it from the car (Figure 8).
Remove the shift lever coupling by taking out the set screw on the left side (Figure 9). Slide the shift rod bushing bracket off the shift rod,
and remove it from the car. Replace the shift rod bushing, and reinstall the bracket and
the coupler (Figure 10).
Before disassembly, take a good look at the shifter mechanism from the top and bottom,
and note how the parts fit together and function. Disassemble the shifter mechanism by
placing it on its side in a vice, and removing the two 10mm lock pawl plate retaining
nuts. Slowly open the vice, releasing the pawl plate springs. Remove the locking clips
from the shifter pivot pin and remove the pin. The shift rod can now be removed, along
with the other internal parts.
To install the new shift pivot housing, the set screw in the front of the shifter
housing (Figure 7) must be removed. Then drive the roll pin at
the opposite side out just far enough to remove the shift pivot housing (Figure 11). Reassemble the shifter mechanism using the new parts,
as shown in the diagram (Figure 11a). Tighten the set screw in the front of the shifter
housing just to the point that end play in the shift pivot housing is eliminated, and
tighten the locknut. Lubricate all of the contact points in the shifter mechanism. I used
a spray lubricant that dries into light greaseWurth HHS 2000.
Reinstall the shifter mechanism into the car (Figure 13).
First, install the two screws into the shift rod bushing bracket (5mm allen-head), and
then the three shifter mechanism mounting screws (6mm allen-head).
If you plan to reuse your stock shifter knob, the shift lever may be too long for it to
fit correctly (Figure 14). I had to trim about 13mm from the
tip of the shift lever for the shift knob to bottom onto the annular ring (Figure 15). You can remove the knob from the old shift lever by
clamping the lever in a vice, and using a 15mm open-end wrench and a mallet to drive it
off. You may also be able to reuse the crush ring for the shift knob, but it is an
inexpensive part, so it is a good idea to have a new one on hand. Be careful with the
shift knobOEM replacements are very expensive.
After installing the short shift kit, I took the car for a test drive. Now it shifts
like a sports car should, with precise, shorter throws. It is easy to select the correct
gear, without worrying about damaging the transmission or the engine by missing a shift.
This kit is one of the nicest upgrades Ive done to my 911, and it really increases
For all your parts needs, please call our Parts Department toll-free at 1-888-280-7799.
Hope this helps,