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GT4 & GTS Gearbox Failures Reported in USA

A very unusual fault Ralph and odd that it only appears to have occured on tracked cars.

Sounds as though it's a synchromesh failure problem, with the gear just rotating on its shaft. A bad batch of parts or an assembly problem perhaps.

As far as I know, with some minor modifications it's basically the same Getrag 'box as that used in other 981-series Caymans.

Jeff

 
Another one reported on the same Rennlist thread, a GTS on track this time:

QUOTE

Hello all. I'm new to Porsche and Rennlist but not to the car obsession. Picked up my Cayman GTS new in June (one of the last allocations around; wanted the NA flat 6 and 6 speed). On my 11th track day and about 6300 miles I was at NCM Motorsports Park in KY and shifted from 2nd to 3rd but.... no 3rd, just revs. The shifter went into the gate no problem, but nobody home. 2nd and 4th ok. I made it home about 450 miles and brought to my purchasing dealership after I cleaned all the rubber off and put on my street tires (I felt I didn't need to flaunt my track use with a major repair needed, and I had no service history with them until now). I did admit to track use when asked.No major incidents in the car before this; I am about 100 track days in, all in manual cars, never had this problem before. All track days have been on stock 19" sized Bridgestone RE71Rs. They made a video of the problem and sent it to Germany and a new transmission was just installed yesterday under full warranty coverage. I asked the service writer if there have been any modifications to the trans to prevent this from happening again but he reported that it is the same unit. Hopefully this will not happen again but I have every intention of tracking it again next summer...

END QUOTE

So track use is a constant, manual gearbox with 3.4L and 3.8L engines (meagre data I know)

 

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