GT4 G81 Transmission Failure
10-28-2016, 01:29 PM
#77
Nordschleife Master
"Are the transmissions the same?" -- I checked (nemiga.com)
- GT4 981 300 020 22
- Spyder 981 300 020 22
- Boxster 981 300 020 21
- Cayman 981 300 020 21
So, no - GT4 & Spyder do NOT have the same transmission as regular Boxsters and Caymans. One revision number different.
- GT4 981 300 020 22
- Spyder 981 300 020 22
- Boxster 981 300 020 21
- Cayman 981 300 020 21
So, no - GT4 & Spyder do NOT have the same transmission as regular Boxsters and Caymans. One revision number different.
10-28-2016, 05:05 PM
#78
Track Day
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^ i feel you pain. there were two in usa. i bought one and have another for spare. not sure where the other is, as of a month ago, atlanta had another. i can source you a correct gear box if you want. not mine. but it is OEM. of ourse this is out of your pocket not warranty.
new is about $10k. this one is much less. i know of only one for sale in USA.
new is about $10k. this one is much less. i know of only one for sale in USA.
10-28-2016, 07:10 PM
#79
Nordschleife Master
Don't kill the messenger. I've gotten to the bottom of this with some help from Sharkwerks and BGB. There is a design change and not for the better. I'll post pictures tonight from my hotel room.
10-28-2016, 07:32 PM
#81
and 
cooling in anticipation of the possible findings,
10-29-2016, 07:34 AM
#82
10-29-2016, 11:19 AM
#83
Nordschleife Master
Morning gents. Sorry for the delayed response. Mooty took me out for Thai food last night and I food coma'd when I got back to my room.
Anyway, here's the rub. I've been saying that these gearboxes are a decade old and even the 3rd gear ratio is the same. But there is a change. Below is the current gt4 gear. This came out of Sharkwerks mule with less than 1000 miles on it. See the welds?
Memory suggested that only 5&6 were welded in the 987 and 3&4 were splined like 915 or gt3 gears. So I rang John Teece and asked him to check. He confirmed for me.
So what's causing the failures? The welds are breaking and the ring is spinning right off the gear.
Anyway, here's the rub. I've been saying that these gearboxes are a decade old and even the 3rd gear ratio is the same. But there is a change. Below is the current gt4 gear. This came out of Sharkwerks mule with less than 1000 miles on it. See the welds?
Memory suggested that only 5&6 were welded in the 987 and 3&4 were splined like 915 or gt3 gears. So I rang John Teece and asked him to check. He confirmed for me.
So what's causing the failures? The welds are breaking and the ring is spinning right off the gear.
10-29-2016, 11:59 AM
#84
Nordschleife Master
Originally Posted by GTgears
Morning gents. Sorry for the delayed response. Mooty took me out for Thai food last night and I food coma'd when I got back to my room.
Anyway, here's the rub. I've been saying that these gearboxes are a decade old and even the 3rd gear ratio is the same. But there is a change. Below is the current gt4 gear. This came out of Sharkwerks mule with less than 1000 miles on it. See the welds?
Memory suggested that only 5&6 were welded in the 987 and 3&4 were splined like 915 or gt3 gears. So I rang John Teece and asked him to check. He confirmed for me.
So what's causing the failures? The welds are breaking and the ring is spinning right off the gear.
Anyway, here's the rub. I've been saying that these gearboxes are a decade old and even the 3rd gear ratio is the same. But there is a change. Below is the current gt4 gear. This came out of Sharkwerks mule with less than 1000 miles on it. See the welds?
Memory suggested that only 5&6 were welded in the 987 and 3&4 were splined like 915 or gt3 gears. So I rang John Teece and asked him to check. He confirmed for me.
So what's causing the failures? The welds are breaking and the ring is spinning right off the gear.
10-29-2016, 03:11 PM
#86
Rennlist Member
Also, a bit disturbing to see such a failure so early on, and in quantity.
Thanks, for this, Matt.
10-29-2016, 03:43 PM
#88
To continue the play by play, or "What one can expect when third gear goes away" I've been told a new transmission will be stateside 11/7. SA guesstimates they will receive the transmission about one week after that. Then it needs to be installed. Dealership became aware of the problem 10/25. So if my experience is typical the repair takes 3-4 weeks.