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WEVO Precision Shift Joint Installation
 
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Pelican Technical Article:

WEVO Precision Shift Joint Installation

Time:

1 hour1 hr

Tab:

$42 to $250

Talent:

**

Tools:

3mm Allen, 13mm (2) wrenches

Applicable Models:

Porsche 911 (1965-89)
Porsche 930 Turbo (1976-89)
Porsche 964 Carrera 2 (1990-94)
Porsche 964 Carrera 4 (1989-94)
Porsche 964 RS America (1993-94)
Porsche 964 Turbo (1991-94)
Porsche 993 Carrera (1995-98)
Porsche 993 Carrera 4 (1995-98)
Porsche 993 Carrera 4S (1996-98)
Porsche 993 Carrera S (1998)
Porsche 993 Targa (1996-98)
Porsche 993 Turbo (1996-97)
Porsche 996 Carrera models (1999)

Parts Required:

PSJ and billet clamp (optional)

Hot Tip:

Take your time adjusting the connections until you get it perfect

Performance Gain:

Sharp, crisp, precision shifts

Complementary Modification:

Install a WEVO shifter

While there is nothing like running up and down through the gears on a classic air cooled 911, heal and toeing while you match revs, this experience can be ruined by the slop that will develop in the shift coupler. The original designed coupler consists of plastic/rubber inserts between the linkage; like a plastic U-joint, that will deteriorate over time and eventually need replacement.

If you have owned a 911 for more than a few years you know the joy of installing a new bushing in your shift coupler, spending time to get the linkage adjustment just perfect and then watch as the coupler bushings start to wear out and your perfect shifts start to develop slop until you need to replace it again and start all over.

The WEVO Stock 911 PSJ, is a high performance upgrade for your 911 shift linkage

mechanism. The unit is a direct replacement for the O.E. coupler used in all 911 series chassis using the 901, 911, 915 and 930 transmissions - including all 912's. The WEVO Stock 911 PSJ can be installed with the original shift tube clamp and original M8 conical nosed set screw. The installation of this unit as a replacement for your O.E. shift coupler will improve accuracy of the shift linkage. It will eliminate "lost motion" where it existed due to original design considerations for NVH (Noise, Vibration, and Harshness) and wear and tear due to use and age.

You may experience a modest increase is transmission noise, this is also normal and a result of the precision achieved by the elimination of the factory plastic bushings and lost motion in the O.E. architecture.

Replacement of the old style coupler is quick and easy, but since you are installing the new PSJ you should allow yourself some time to set up the shifter connections. This can be a little of a "dark art" and sometimes you get it perfect on the first try and other times it can take a while; this is normal so don't get frustrated.

The shift coupler is located under the access panel in the center tunnel behind the front seats.
Figure 1

The shift coupler is located under the access panel in the center tunnel behind the front seats. Remove the access panel and you will see the input shaft to the transmission (yellow arrow), the old style shift coupler (red arrow) and the shift rod (blue arrow). Begin by placing the transmission in first gear.

Use a 3mm Allen and remove the M8 conical screw that connects the coupler to the transmission input shaft (red arrow).
Figure 2

Use a 3mm Allen and remove the M8 conical screw that connects the coupler to the transmission input shaft (red arrow).

You are going to reuse this conical screw when installing the PSJ so do not lose it.
Figure 3

You are going to reuse this conical screw when installing the PSJ so do not lose it.

Since you will not be reinstalling the old coupler there is no point in making a scribe mark on the shift rod.
Figure 4

Since you will not be reinstalling the old coupler there is no point in making a scribe mark on the shift rod. Use two 13mm wrenches and if you are installing the WEVO billet clamp with your new PSJ you can remove the old hardware and clamp, if you are using the original clamp you just need to loosen the nuts and bolt.

Move the shifter to second gear, this will move the shift rod forward and allow you to remove the coupler from the tunnel.
Figure 5

Move the shifter to second gear, this will move the shift rod forward and allow you to remove the coupler from the tunnel.

If you are installing the WEVO billet clamp remove the old clamp from the shift rod.
Figure 6

If you are installing the WEVO billet clamp remove the old clamp from the shift rod. Note that there is a recession in the rod end that the nut and bolt for the clamp goes through (red arrow) this will mean you need to install the clamp with the bolt removed (red arrow).

With the old coupler out of the car you can see how the bushings break down and develop slop (red arrows).
Figure 7

With the old coupler out of the car you can see how the bushings break down and develop slop (red arrows).

Here is the WEVO precision Joint Shifter beside the old coupler.
Figure 8

Here is the WEVO precision Joint Shifter beside the old coupler. Remember that you will need to reuse the conical screw!

The WEVO Stock 911 PSJ is a service free design.
Figure 9

The WEVO Stock 911 PSJ is a service free design. The neoprene boot is designed to keep dirt from the mechanism. The boot is removable for cleaning and inspection purposes, should the need arise--like you have a leaking input shaft seal. When the joint is installed, check to ensure that the boot is correctly seated in the retaining groove and not dislodged during installation.

With the boot off you can see the quality of craftsmanship and materials in the PSJ.
Figure 10

With the boot off you can see the quality of craftsmanship and materials in the PSJ. The joint comes pre-lubricated and ready for installation and while it may feel a little tight while it is out of the car due to tight manufacturing tolerances, this is no cause for concern, the unit will perform perfectly once installed and being used.

While you do not need to use the WEVO billet clamp when installing the PSJ, it makes a really nice addition and comes complete with new hardware, wavy washers and Nylock nut.
Figure 11

While you do not need to use the WEVO billet clamp when installing the PSJ, it makes a really nice addition and comes complete with new hardware, wavy washers and Nylock nut.

Clean up the input shaft and shifter rod and install the new clamp and hardware; do not tighten the hardware yet (red arrow).
Figure 12

Clean up the input shaft and shifter rod and install the new clamp and hardware; do not tighten the hardware yet (red arrow).

Place the PSJ on the input shaft and install the conical screw (red arrow).
Figure 13

Place the PSJ on the input shaft and install the conical screw (red arrow). Line the WEVO up with the shift rod (yellow arrow).

Move the shifter back into the first gear position and snug down the 13mm nut and bolt.
Figure 14

Move the shifter back into the first gear position and snug down the 13mm nut and bolt. If you are sitting in the driver's seat in the correct position you should get the linkage close just from muscle memory but you need to be prepared to "dial it in" a little at a time until the shifter pattern is perfect. If you have one, lift up the rubber boot on the base of the shifter and check for the clearance of the reverse lock out. Make small adjustments back and forth and left and right gently snugging down the 13mm nut until you have it prefect. Tighten the nut down completely and go for a test drive. Once you have the PSJ set it is set for life so get it right and then enjoy it forever. Remember if you need to remove the PSJ from the transmission for any reason like replacing the input seal always remove the conical screw and NOT the clamp; this way you can slip the PSJ back into the input shaft tighten the conical screw and no adjustments will be necessary.

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