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Installing the GBox Second Gear Shift Detent
 
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Pelican Technical Article:

Installing the GBox Second Gear Shift Detent

Time:

15 minutes15 mins

Tab:

$100

Talent:

**

Tools:

13mm wrench or 6mm Allen key, strong magnet

Applicable Models:

Porsche 996 Carrera models (1999-05)
Porsche 996 Turbo, GT2, GT3 (2001-05)

Parts Required:

Shift Detent Pin

Hot Tip:

Use a little heat to break free the retaining plug on the transmission.

Performance Gain:

Car will no longer pop out of second gear.

Complementary Modification:

Replace mounts if transmission is removed from the car.

While the 996 transmission is normally a very dependable unit, some transmissions are known to have a problem where the car will tend to pop out of second gear. There are a few different ways to fix this issue. The cheapest and easiest is to install an updated shift detent pin (See Figure 1). GBox has developed an updated detent pin that prevents the gear from popping out, provided that there is not already damage to the internal components of the transmission.

This upgrade can be performed with the transmission in the car. You also won't have to drain the transmission as the detent pin sits above the level of the transmission oil. In this article, I'll go over the steps involved with installing the detent pin.

In our case, the transmission has been removed for additional clarity. Begin by locating the detent pin cover plug on the right (passenger) side of the transmission in front of the axle (See Figure 2). You'll see that right above the plug is a bolt that holds the gearbox assembly to the differential housing. You'll need to remove this bolt to have clearance to remove the plug (See Figure 3). On most 996 cars, it will be a 13mm hex bolt. On GT2/GT3 transmissions it will be a 6mm Allen bolt.

Once the mounting bolt has been removed, use a 8mm Allen key to remove the plug from the transmission (See Figure 4). You'll find that the plug will be really tight. If you just can't get it to budge, you may want to try heating the area around the cap with a torch. This will help to release the sealant. Once the plug is removed, clean it and set it aside in a safe place.

Now take a strong magnet and remove the spring directly below the plug. It should come out pretty easily (See Figure 5). Directly below it is the detent pin itself (See Figure 6). You'll need to pull the detent pin up and out of the transmission. It helps to play with the gearshift selector arm to help release the detent. Once released, pull the detent pin up and out of the hole (See Figure 7). Note the orientation of the detent pin.

Take the new detent pin and orient it so that the center axle of the small wheel inside is 90 degrees to the centerline of the transmission (See Figure 8). This is important. The wheel inside the detent engages a plate inside the transmission. Press the detent pin down into the hole until you feel the plate inside engage the detent pin.

Once the detent pin is pressed all the way down, take the spring you removed earlier and place it into the center of the new detent pin. Then refit the cover plug and the mounting bolt for the transmission. And that's it, you're done!.

Shown here is the Gbox detent shift pin for the 996 transmission.
Figure 1

Shown here is the Gbox detent shift pin for the 996 transmission.

Locate the detent cover plug on the right side of the transmission (green arrow).
Figure 2

Locate the detent cover plug on the right side of the transmission (green arrow). You'll need to remove one of the transmission mating bolts in order to remove the plug (purple arrow).

Use a 13mm wrench to remove the upper bolt on most 996 transmissions.
Figure 3

Use a 13mm wrench to remove the upper bolt on most 996 transmissions. On GT2/GT3 transmissions, this bolt will be a 6mm Allen bolt.

Remove the 8mm Allen plug in the top of the transmission.
Figure 4

Remove the 8mm Allen plug in the top of the transmission. If you can't get the plug loose, heating the area with a torch may help.

Use a strong magnet to remove the spring directly below the plug (green arrow).
Figure 5

Use a strong magnet to remove the spring directly below the plug (green arrow).

Below the spring is the factory detent pin.
Figure 6

Below the spring is the factory detent pin. You'll have to grab the end of the pin and pull it up enough to remove it. It helps to play with the gearshift selector arm to help release the detent

Use the magnet to pull the old detent pin up and out of the transmission.
Figure 7

Use the magnet to pull the old detent pin up and out of the transmission.

Insert the Gbox detent pin into the hole.
Figure 8

Insert the Gbox detent pin into the hole. It's important that you insert the detent pin in the correct orientation with the small wheel at 90 degrees to the centerline of the transmission as shown here (green arrow).

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