We have developed a kit to replace the 928 5-speed with a Tremec T56 6-speed from a Corvette.

We have sold 6 of these kits already and installed 3 more. Very happy customers.

The Corvette 6-speed has more favorable gear ratios, can hold more HP and Torque without breakage, and has a much better limited-slip differential.

Details of this kit can be seen here:
928 Motorsports - 5 to 6-speed Transaxle Upgrade Kit For The Porsche® 928

We can also install this kit for you if you prefer.

ALSO: for those of you who always wished your automatic-equipped 928 was a manual - here's your chance! We can convert your automatic trans Porsche to this 6-speed for just a little more than what it costs to buy a good used 5-speed 928 trans (if you can find one).

Details here:
928 Motorsports - Automatic to 6-speed Transaxle Conversion Kit For The Porsche® 928

 

a few more pics...

 

here is a nice video from a drive...




https://www.youtube.com/watch?v=oWzF2dKqyI0

 

this video is from an automatic car now converted to a 6-speed manual




https://www.youtube.com/watch?v=YCmBpVS6q1c