3.4/3.6 gearboxes are they the same?
09-02-2017, 09:24 PM
#3
The differences are internal , some weak points of the earlier car were addressed , spider gears changed and the later gearboxes have a tab removed so fitting a lsd is a bit easier
09-03-2017, 01:10 PM
#5
AutoX
Also the differential pinion bearing is slightly different. Problem is you can no longer order the earlier 3.4 bearing, so you have to make up a shim to fit the later bearing.
09-03-2017, 01:18 PM
#6
Drifting
We should really be using gearbox manufacturer part numbers for this discussion.
The best info I found is from GBox - the acknowledged experts here.
http://www.gboxweb.com/996specs.html
Anyone got better info from Getrag?
The other source would be California Motor Sports.
https://californiamotorsports.net/pa...specifications
Note the suffix after the G96 - it is 00 or 01, 30/31
09-03-2017, 01:41 PM
#7
Rennlist Member
Just remember the shifter cables are different on mark one cars also. Transmission end changed, ones a ball stud the other was more like a pin. I changed mine when I replaced my transmission.
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09-03-2017, 02:29 PM
#8
AutoX
Wow, great detail from a new guy.Thank you.
We should really be using gearbox manufacturer part numbers for this discussion.
The best info I found is from GBox - the acknowledged experts here.
http://www.gboxweb.com/996specs.html
Anyone got better info from Getrag?
The other source would be California Motor Sports.
https://californiamotorsports.net/pa...specifications
Note the suffix after the G96 - it is 00 or 01, 30/31
We should really be using gearbox manufacturer part numbers for this discussion.
The best info I found is from GBox - the acknowledged experts here.
http://www.gboxweb.com/996specs.html
Anyone got better info from Getrag?
The other source would be California Motor Sports.
https://californiamotorsports.net/pa...specifications
Note the suffix after the G96 - it is 00 or 01, 30/31
I recently rebuilt my gearbox along with fitting a new LSD:
09-03-2017, 03:22 PM
#9
AutoX
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Looks like changing the bell housing over is not a diy job?
Reason being ive been offered a 3.6 transmission with a cracked bell housing and was sort of hopping i could just swap it with my 3.4 transmission.
Reason being ive been offered a 3.6 transmission with a cracked bell housing and was sort of hopping i could just swap it with my 3.4 transmission.
09-03-2017, 04:19 PM
#10
Drifting
CLR,
"No problem Speed Yellow".
At last ,someone who reads German:-).
But why were the old Bundepost VW vans yellow ? - not to indicate speed potential as I recall !
Your gearbox rebuild is impressive.
I have participated in a few Threads here that detailed G96 and G86(Boxster)gearbox rebuilds. The weak components were usually 2nd gear teeth and the sealed pinion bearing. We had extreme difficulty with special tools, wildly expensive bearings and uncertainty about procedures and specifications. It would be easy to damage a G96 transaxle during a rebuild. For example the force required to remove the 2nd gear cluster from its hollow shaft.
If you have any information to add to the previous Threads you would be a hero here. The reason I mention this is that there are very few places in the U.S.A. that rebuild this transaxle competently. As these cars accumulate more miles, gearbox repairs will become a bigger problem. It could become a bigger issue than engine repair.
The other issue with the few other Threads on this subject is that many dismantling photos have been lost to the Image Hosting failure. A picture(on Rennlist..)is worth ...
Here is some background for others to get up to speed:
"G96:
The G96 gearbox was introduced at the start of production 996/986 cars. A 986 (Boxster) gearbox has the G86 gearbox designation. The G86 is basically the same as a 996 gearbox with the ring and pinion swapped for the mid-engine configuration. The most noticeable difference in these gearboxes is the cable shifter. All 996/986 cars other than 1998 996 GT3 cars use a cable shifter.
The standard 996 gearbox (G96.00, G96.01, G96.30, and G96.31) is a development all its own which is similar to some current VAG (VW Audi Group) products, but shares almost nothing with other Porsche transmissions. There are many 996s that have suffered from ring and pinion failures, synchronizers, and other maladies at a variety of mileages. The only fix is to replace with a Porsche remanufactured unit, or a good used one. Parts for these gearboxes cannot be obtained by the manufacturer or Porsche. They unfortunately cannot be fixed.
The 996 GT3 gearbox is different (type G96.90, G96.93, G96.96) from the standard 996. The GT3 gearbox has evolved from the 993 GT2 which in turn evolved from the 993 TT, and before that the 1989 930 G50.50. The current GT3 box is also used in the 996TT/GT2 and 996 GT3 Cup/GT3 RS/RSR race cars. It has a dedicated oil pump and external oil/water intercooler, steel synchronizer rings on gears 3-5, and interchangeable gear ratios (main shaft assembled from individual ratios that are positioned, not pressed into place), and a 40%/60% asymmetrical clutch type limited slip differential. "
http://www.lufteknic.com/trans/
"No problem Speed Yellow".
At last ,someone who reads German:-).
But why were the old Bundepost VW vans yellow ? - not to indicate speed potential as I recall !
Your gearbox rebuild is impressive.
I have participated in a few Threads here that detailed G96 and G86(Boxster)gearbox rebuilds. The weak components were usually 2nd gear teeth and the sealed pinion bearing. We had extreme difficulty with special tools, wildly expensive bearings and uncertainty about procedures and specifications. It would be easy to damage a G96 transaxle during a rebuild. For example the force required to remove the 2nd gear cluster from its hollow shaft.
If you have any information to add to the previous Threads you would be a hero here. The reason I mention this is that there are very few places in the U.S.A. that rebuild this transaxle competently. As these cars accumulate more miles, gearbox repairs will become a bigger problem. It could become a bigger issue than engine repair.
The other issue with the few other Threads on this subject is that many dismantling photos have been lost to the Image Hosting failure. A picture(on Rennlist..)is worth ...
Here is some background for others to get up to speed:
"G96:
The G96 gearbox was introduced at the start of production 996/986 cars. A 986 (Boxster) gearbox has the G86 gearbox designation. The G86 is basically the same as a 996 gearbox with the ring and pinion swapped for the mid-engine configuration. The most noticeable difference in these gearboxes is the cable shifter. All 996/986 cars other than 1998 996 GT3 cars use a cable shifter.
The standard 996 gearbox (G96.00, G96.01, G96.30, and G96.31) is a development all its own which is similar to some current VAG (VW Audi Group) products, but shares almost nothing with other Porsche transmissions. There are many 996s that have suffered from ring and pinion failures, synchronizers, and other maladies at a variety of mileages. The only fix is to replace with a Porsche remanufactured unit, or a good used one. Parts for these gearboxes cannot be obtained by the manufacturer or Porsche. They unfortunately cannot be fixed.
The 996 GT3 gearbox is different (type G96.90, G96.93, G96.96) from the standard 996. The GT3 gearbox has evolved from the 993 GT2 which in turn evolved from the 993 TT, and before that the 1989 930 G50.50. The current GT3 box is also used in the 996TT/GT2 and 996 GT3 Cup/GT3 RS/RSR race cars. It has a dedicated oil pump and external oil/water intercooler, steel synchronizer rings on gears 3-5, and interchangeable gear ratios (main shaft assembled from individual ratios that are positioned, not pressed into place), and a 40%/60% asymmetrical clutch type limited slip differential. "
http://www.lufteknic.com/trans/
Last edited by Schnell Gelb; 09-03-2017 at 06:32 PM.
