Carl Fausett

Like many of us, I always thought that the "slop" manufactured in to the rear shift coupler on the 928 was meant to allow the shift rails to drop into their detents without resistance.

That is to say, if we took all the slop out of the rear shift coupler, the 928 might not shift right.

We have found that this was not true - in fact, I think it shifts better than ever.
It seems that the only reason for the little air gap designed into the rear shift coupler was to prevent transfer of any transaxle vibration up into the hand of the driver.

Having driven this modification now both on the race car and on my street car (a 91 928 GT) I can tell you it will be a go-to upgrade on every 928 I own from here on. Its one of those "why didn't we do this before" things that works so well and is so simple to install, and a perfect compliment to our Precision Shifter Ball Cup in the front.

More info about it here: http://www.928motorsports.com/parts/...r_coupling.php

I priced it as a kit so you can modify your own rear shift coupler; or as a complete part where we start with the all-new rear coupler from Porsche and modify it for you.

Enjoy!

James Bailey

Also eliminates the possibility of the stock press fit pin falling out which happens once in a while.....usually at the track !!

James Bailey

I always thought the slop was there for the very early cars where the forward shift rod guide sleeve was bolted to the tunnel and not to the torque tube. Which did cause more movement as the engine trans flopped around but the shifter was linked to the chassis.

Ducman82

should have come from the factory like that. my pin was loose as well.

Carl Fausett

...as Mark and I found out at Road America in October.

whiteNSXs

Looks great. I have always appreciated the dedications to such a small market.
Steve

hacker-pschorr

I was wondering how long it was going to take you to hit the market with this.

Well done.

Wait.....Porsche originally bolted the shift lever to the chassis and moved it to the torque tube?

James Bailey

Yes , the front guide sleeve was attached to the tunnel. Was soon moved to the torque tube. Very early tubes have no studs welded to them.....

Dave928S

Nice alternative to the press fit shaft.

I take it that the stock boot will no longer fit over the extra width from the bolt head and castellated nut ... ?

Carl Fausett

I like your explanation of why the OEM part has that much compliance in it best, Jim. My 1978 was one of those with the forwardshift guide mounted to the body. Figure with rubber motor mounts, a little torque when letting out the clutch - yep - that compliance was probably needed in 1978.

After they moved the forward guide to the torque tube, the motor, TT and transaxle moves all at the same time in the same direction. The air gap in the rear coupler doesn't seem to be needed.

I have a video of it coming - will post when its up.

Carl Fausett

It might. That rubber boot is removed so I could take the photos, and I found it so cracked and torn up I did not put it back on.

Carl Fausett

Video is up:

hb253

I must be persona non grata. My post on this thread is gone.....

Imo000

Other posts are missing too.

SeanR

Odd how that happens on certain threads.