Transfer case
03-01-2018, 12:06 AM
#391
Rennlist Member
Found this regarding chain sizes
PL 72 ATC transfer case - Starting with OE code 95834101008 and 95834101033 the dimension has been changed from 1" to 1,25" for following parts: Housing, Chain, Sprocket ASM, Sprocket Output, Deflector Front, Deflector Rear. For OE codes 95834101001 - 95834101007 and 95834101030 - 95834101032 only parts with dimension 1" can be used.
PL 72 T transfer case - For OE code 0BU341011D and starting with OE code 95834102012 the dimension has been changed from 1" to 1,25" for following parts: Housing, Chain, Sprocket ASM, Sprocket Output, Deflector Front, Deflector Rear. For OE code 95834102011 only parts with Dimension 1" can be used.
http://www.s-tec.at/data/Powertrain/...018_screen.pdf
(I'll delete if i'm wrong here to keep misinformation out of this post) So someone help me here, is the ACT 350/450 replacement clutch kit compatible for Cayennes with a transfer case actuator? Such as this from Cobra Transmissions, that's actually stateside?? https://cobratransmission.com/ATC350-ATC450-Clutch-Kit
PL 72 ATC transfer case - Starting with OE code 95834101008 and 95834101033 the dimension has been changed from 1" to 1,25" for following parts: Housing, Chain, Sprocket ASM, Sprocket Output, Deflector Front, Deflector Rear. For OE codes 95834101001 - 95834101007 and 95834101030 - 95834101032 only parts with dimension 1" can be used.
PL 72 T transfer case - For OE code 0BU341011D and starting with OE code 95834102012 the dimension has been changed from 1" to 1,25" for following parts: Housing, Chain, Sprocket ASM, Sprocket Output, Deflector Front, Deflector Rear. For OE code 95834102011 only parts with Dimension 1" can be used.
http://www.s-tec.at/data/Powertrain/...018_screen.pdf
(I'll delete if i'm wrong here to keep misinformation out of this post) So someone help me here, is the ACT 350/450 replacement clutch kit compatible for Cayennes with a transfer case actuator? Such as this from Cobra Transmissions, that's actually stateside?? https://cobratransmission.com/ATC350-ATC450-Clutch-Kit
03-01-2018, 10:36 AM
#392
Yesterday I was at one of two P dealers local to me that I do business with. While checking out some new rides, my salesman introduced me to one of their more senior technicians that happened to be in the sales area at the time.
In chatting with him about a number of things, we got on the subject of the 958 transfer cases. He mentioned the latest revision of the case (which we've discussed in this thread) and the associated new hardware like the vent kit, etc.
According to him, the issue has always been a contamination of the fluid. The total amount of fluid the TC holds is very little actually (1 liter or so?), so any small amount of contamination can have significant impact, and that impact specifically degrades the friction modifiers in the fluid which is at the root of the problem. In some cases a fluid change corrects the issue (which we've seen evidence of), and then in other instances the damage caused by the fluid contamination is more severe and thus permanent, requiring a TC replacement. He mentioned that the vent kit helps reduce fluid contamination, but it is recommended now that the fluid in those transfer cases (even the new design) be replaced every 20k miles.
Just passing on this information.
Cheers all.
In chatting with him about a number of things, we got on the subject of the 958 transfer cases. He mentioned the latest revision of the case (which we've discussed in this thread) and the associated new hardware like the vent kit, etc.
According to him, the issue has always been a contamination of the fluid. The total amount of fluid the TC holds is very little actually (1 liter or so?), so any small amount of contamination can have significant impact, and that impact specifically degrades the friction modifiers in the fluid which is at the root of the problem. In some cases a fluid change corrects the issue (which we've seen evidence of), and then in other instances the damage caused by the fluid contamination is more severe and thus permanent, requiring a TC replacement. He mentioned that the vent kit helps reduce fluid contamination, but it is recommended now that the fluid in those transfer cases (even the new design) be replaced every 20k miles.
Just passing on this information.
Cheers all.
I can imagine that condensation inside the case could produce enough moisture to mess with that little fluid. It really isn't taking up much of the space.
03-06-2018, 11:53 PM
#394
Pro
Hey Brent, you don't happen to service your Cayenne in Bellevue, do you? I ask because mine was in for service today and they mentioned that they were doing 2 transfer case jobs. I tried to get them to R&R mine but they continued to say they couldn't reproduce. Can you describe your symptoms?
03-07-2018, 12:13 AM
#395
Rennlist Member
Hey Brent, you don't happen to service your Cayenne in Bellevue, do you? I ask because mine was in for service today and they mentioned that they were doing 2 transfer case jobs. I tried to get them to R&R mine but they continued to say they couldn't reproduce. Can you describe your symptoms?
My symptoms were binding with parking lot turns, light throttle applications produced obvious stuttering (like pushing the front wheels that weren't ready to spin)and medium acceleration produced a missing sensation (misfire). Mine was most obvious warmed up. In fact I was worried that the car wasn't warm enough because the symptoms were milder today.
Good luck. Mines been weird for a while but became more pronounced recently.
03-08-2018, 08:17 PM
#396
Drifting
Just FYI for everyone related to the particular symptom mentioned above.... when I had my transfer case replaced last year (latest revision), it eliminated most of that condition but did not completely get rid of it 100%. When I had my CTT in to the dealer recently for the AH08 recall, I also had them replace the fluid in the rear PTV diff. This completely eliminated the remaining binding in low speed sharp turns.
So that tells me that the clutch packs in the TC and the rear diff need the proper uncontaminated fluid. The tech recommended replacing each every 20k miles, or once a year, just to keep things fresh and in check.
So that tells me that the clutch packs in the TC and the rear diff need the proper uncontaminated fluid. The tech recommended replacing each every 20k miles, or once a year, just to keep things fresh and in check.
03-09-2018, 10:28 AM
#397
Rennlist Member
Just FYI for everyone related to the particular symptom mentioned above.... when I had my transfer case replaced last year (latest revision), it eliminated most of that condition but did not completely get rid of it 100%. When I had my CTT in to the dealer recently for the AH08 recall, I also had them replace the fluid in the rear PTV diff. This completely eliminated the remaining binding in low speed sharp turns.
So that tells me that the clutch packs in the TC and the rear diff need the proper uncontaminated fluid. The tech recommended replacing each every 20k miles, or once a year, just to keep things fresh and in check.
=Steve
03-10-2018, 07:57 PM
#398
Rennlist Member
Wow, wow, wow. I knew there was something amiss with the car and likely the diff but the difference in how it drives after the repacement is night and day. Smooth power delivery, no surging. Amazing.
03-10-2018, 11:27 PM
#399
Rennlist Member
Just had a chat with someone that knows quite a bit about this type of transfer case. I showed him my pics of the fluid and they confirmed that its a piece of friction disc. Said that its either due to overheating or the fluid is contaminated.
I'll be ordering the revised vent kit, a friction disc set and new chain (said its the chain if the car ever jerks while cornering with a light acceleration. Mine does not but since I'm in there....). I'll hopefully be able do the rebuild sometime in April so let me know if theres something you want to see.
I'll be ordering the revised vent kit, a friction disc set and new chain (said its the chain if the car ever jerks while cornering with a light acceleration. Mine does not but since I'm in there....). I'll hopefully be able do the rebuild sometime in April so let me know if theres something you want to see.
03-11-2018, 09:23 AM
#400
Drifting
03-11-2018, 01:55 PM
#401
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Just had a chat with someone that knows quite a bit about this type of transfer case. I showed him my pics of the fluid and they confirmed that its a piece of friction disc. Said that its either due to overheating or the fluid is contaminated.
I'll be ordering the revised vent kit, a friction disc set and new chain (said its the chain if the car ever jerks while cornering with a light acceleration. Mine does not but since I'm in there....). I'll hopefully be able do the rebuild sometime in April so let me know if theres something you want to see.
I'll be ordering the revised vent kit, a friction disc set and new chain (said its the chain if the car ever jerks while cornering with a light acceleration. Mine does not but since I'm in there....). I'll hopefully be able do the rebuild sometime in April so let me know if theres something you want to see.
03-11-2018, 04:44 PM
#402
You'll need 2 ea. #4, plus 5, 6, 50, 37, 43, and 48 from the parts diagram in post #371. May need others once you get it apart. Also get the cir-clips for the drive shaft going into the rear diff. if you disconnect this. Good luck.
03-30-2018, 11:34 AM
#404
Add my Cayenne to the list. 2013 CTT with approx 60k miles, was experiencing slipping upon acceleration. Dealer installed new transfer case and vent line. Now it's buttery smooth. Going forward, I will include a TC fluid change to my maintenance plan, as others here have suggested.
