2 nd to 3rd gear 997.1 Tiptronic clutch slip
06-22-2022, 02:48 AM
#1
2 nd to 3rd gear 997.1 Tiptronic clutch slip
Hello guys, I was reading around and I have found some answers, but nothing has helped yet. I have a 997.1 C2S in Tiptronic and I am having problems with a sensation of the clutch slipping from 2nd to 3rd gear primarily. I could even feel it in other gears, but it is super minimal, basically fine. The car only has 20k miles and I apologize, in all these years I have not done a transmission oil change yet. I was wondering if that could help, or my primary question is what this could even be. I was thinking of replacing the clutch, but it does not sound logical that it would only happen from 2nd to 3rd. When it shifts there is quite a delay and the rpm fly up. The issue became gradual. I only use it a couple times per year, but I’d love to fix this. I’m just worried that I will have to replace the whole transmission… Thank you guys)
06-22-2022, 07:53 AM
#2
I think your transmission is made by Mercedes (722.6) and very closely related to the ones they put in CLK55 or Hemi powered Chrysler.
2nd to 3rd gear flare is pretty common issue. Many recommends checking your fluid level. This transmission is known to leak fluid from conductor plate connector seal; minor leak might just affect fluid level but if left alone, it can cause short and causing many shifting issues.
If no leak or fluid level is fine, next to check is conductor plate and shift solenoids.
Your best bet is to let somebody who is very familiar with Mercedes or Chrysler transmission to take a look at yours (or find an indy who works alot with Mercedes).
Porsche doesn't sell tiptronic parts, they only do factory reman exchange. You can get parts from Mercedes or Chrysler dealer. I had a 996.2 with tiptronic and had to get parts from Chrysler dealer (cheaper than Mercedes for same part).
2nd to 3rd gear flare is pretty common issue. Many recommends checking your fluid level. This transmission is known to leak fluid from conductor plate connector seal; minor leak might just affect fluid level but if left alone, it can cause short and causing many shifting issues.
If no leak or fluid level is fine, next to check is conductor plate and shift solenoids.
Your best bet is to let somebody who is very familiar with Mercedes or Chrysler transmission to take a look at yours (or find an indy who works alot with Mercedes).
Porsche doesn't sell tiptronic parts, they only do factory reman exchange. You can get parts from Mercedes or Chrysler dealer. I had a 996.2 with tiptronic and had to get parts from Chrysler dealer (cheaper than Mercedes for same part).
Last edited by laphan; 06-22-2022 at 07:55 AM.
06-22-2022, 08:03 AM
#3
A transmission oil change (ATF) seems like a good place to start if it has never been done. ATF should be changed every 12 years or 120,000 miles. My car had 75,000 miles at the 12 year mark, and I noticed an improvement in shifting. So even if you have a low milage car, if it's over 12 years old changing the ATF and filter sounds like a good place to start.
06-22-2022, 09:05 AM
#4
RL Community Team
Rennlist Member
Rennlist Member
Not many problems with Tiptronic transmissions and in much higher HP and towing load situations than we see in our Carrera 997s. Start with a fluid and filter change and see if it helps. If not the slippage you're feeling has likely already damaged the friction bands.
06-22-2022, 12:41 PM
#5
I went through this with my 2002 996, which was the first year Porsche switched from the ZF to Mercedes transmission. Ironically, my tranny started to slip after the filter and fluid were changed at a Porsche Indy, not long after purchase. The transmission has all 722.6 internal parts inside a Porsche designed case.
When you look for a transmission shop tell them it is a 722.6 tranny first. Then tell them it is in a Porsche 911. In my case I had one shop remove it and brought just the transmission to a specialist. There was no way I was going to let a tranny shop learn how to remove it from my car.
Upon disassembly the transmission shop found a set or worn and burned clutch plates. So those were replaced in addition to the conductor plate and wiring harness (both of which are known wear or failure items in the 722.6). As Petza mentioned don't even think of getting parts from Porsche. All are available via Mercedes or Chrysler except for the rear housing gasket (rear meaning pointing towards the front of the car, which really is the rear of the tranny). There is a shop in NJ that makes the gasket, but I cannot remember the name or find my receipt for it. Just Google "rebuild Porsche transmissions + NJ to find it. Make sure you use the Porsche spec'd tranny fluid. You don't have to buy it from Porsche, but you do need the correct fluid. I found Pentosin brand and ordered it from Advanced Auto.
Oh, and one more thing. Have the shop (if you are not going to do the work) drop the engine and tranny together first and then separate the transmission from the engine. There was a post or two in the 996 forum about removing a tiptronic in the car so that was the direction I gave to my Indy. Well, they tried for several hours and ended up dropping the whole drivetrain (engine and tranny). I paid dearly in extra labor for that lesson, so just avoid all together.
Okay, last point. When you get the tranny back make sure the installer checks and fills the diff. In my case I casually mentioned it to my Indy and sure enough the diff was empty after getting the tranny back from the specialist.
When you look for a transmission shop tell them it is a 722.6 tranny first. Then tell them it is in a Porsche 911. In my case I had one shop remove it and brought just the transmission to a specialist. There was no way I was going to let a tranny shop learn how to remove it from my car.
Upon disassembly the transmission shop found a set or worn and burned clutch plates. So those were replaced in addition to the conductor plate and wiring harness (both of which are known wear or failure items in the 722.6). As Petza mentioned don't even think of getting parts from Porsche. All are available via Mercedes or Chrysler except for the rear housing gasket (rear meaning pointing towards the front of the car, which really is the rear of the tranny). There is a shop in NJ that makes the gasket, but I cannot remember the name or find my receipt for it. Just Google "rebuild Porsche transmissions + NJ to find it. Make sure you use the Porsche spec'd tranny fluid. You don't have to buy it from Porsche, but you do need the correct fluid. I found Pentosin brand and ordered it from Advanced Auto.
Oh, and one more thing. Have the shop (if you are not going to do the work) drop the engine and tranny together first and then separate the transmission from the engine. There was a post or two in the 996 forum about removing a tiptronic in the car so that was the direction I gave to my Indy. Well, they tried for several hours and ended up dropping the whole drivetrain (engine and tranny). I paid dearly in extra labor for that lesson, so just avoid all together.
Okay, last point. When you get the tranny back make sure the installer checks and fills the diff. In my case I casually mentioned it to my Indy and sure enough the diff was empty after getting the tranny back from the specialist.
06-22-2022, 12:57 PM
#6
I went through this with my 2002 996, which was the first year Porsche switched from the ZF to Mercedes transmission. Ironically, my tranny started to slip after the filter and fluid were changed at a Porsche Indy, not long after purchase. The transmission has all 722.6 internal parts inside a Porsche designed case.
When you look for a transmission shop tell them it is a 722.6 tranny first. Then tell them it is in a Porsche 911. In my case I had one shop remove it and brought just the transmission to a specialist. There was no way I was going to let a tranny shop learn how to remove it from my car.
Upon disassembly the transmission shop found a set or worn and burned clutch plates. So those were replaced in addition to the conductor plate and wiring harness (both of which are known wear or failure items in the 722.6). As Petza mentioned don't even think of getting parts from Porsche. All are available via Mercedes or Chrysler except for the rear housing gasket (rear meaning pointing towards the front of the car, which really is the rear of the tranny). There is a shop in NJ that makes the gasket, but I cannot remember the name or find my receipt for it. Just Google "rebuild Porsche transmissions + NJ to find it. Make sure you use the Porsche spec'd tranny fluid. You don't have to buy it from Porsche, but you do need the correct fluid. I found Pentosin brand and ordered it from Advanced Auto.
Oh, and one more thing. Have the shop (if you are not going to do the work) drop the engine and tranny together first and then separate the transmission from the engine. There was a post or two in the 996 forum about removing a tiptronic in the car so that was the direction I gave to my Indy. Well, they tried for several hours and ended up dropping the whole drivetrain (engine and tranny). I paid dearly in extra labor for that lesson, so just avoid all together.
Okay, last point. When you get the tranny back make sure the installer checks and fills the diff. In my case I casually mentioned it to my Indy and sure enough the diff was empty after getting the tranny back from the specialist.
When you look for a transmission shop tell them it is a 722.6 tranny first. Then tell them it is in a Porsche 911. In my case I had one shop remove it and brought just the transmission to a specialist. There was no way I was going to let a tranny shop learn how to remove it from my car.
Upon disassembly the transmission shop found a set or worn and burned clutch plates. So those were replaced in addition to the conductor plate and wiring harness (both of which are known wear or failure items in the 722.6). As Petza mentioned don't even think of getting parts from Porsche. All are available via Mercedes or Chrysler except for the rear housing gasket (rear meaning pointing towards the front of the car, which really is the rear of the tranny). There is a shop in NJ that makes the gasket, but I cannot remember the name or find my receipt for it. Just Google "rebuild Porsche transmissions + NJ to find it. Make sure you use the Porsche spec'd tranny fluid. You don't have to buy it from Porsche, but you do need the correct fluid. I found Pentosin brand and ordered it from Advanced Auto.
Oh, and one more thing. Have the shop (if you are not going to do the work) drop the engine and tranny together first and then separate the transmission from the engine. There was a post or two in the 996 forum about removing a tiptronic in the car so that was the direction I gave to my Indy. Well, they tried for several hours and ended up dropping the whole drivetrain (engine and tranny). I paid dearly in extra labor for that lesson, so just avoid all together.
Okay, last point. When you get the tranny back make sure the installer checks and fills the diff. In my case I casually mentioned it to my Indy and sure enough the diff was empty after getting the tranny back from the specialist.
I think we are referring to this shop (famous 722.6 transmission shop in NJ): https://www.importperformancetrans.c...ct_list&c=2685
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06-25-2022, 04:20 AM
#8
Thank you guys for the feedback, I really appreciate it. I will now be doing an oil change and a transmission oil change this next week and if it does not help then I am going all out and taking the transmission to one mercedes transmission specialist I know. I will keep you updated. If in the meantime anyone has other tips let me know.