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nightop 12-18-2011 07:21 PM

2006 TJ Rubicon NSG370 Transmission Leak Problems
Hello, I've got a 2006 TJ Rubicon w/ ~78K miles on it with a 4.0 L engine and a 6-speed NSG370 transmission. The transmission is a Mercedes and requires a specific transmission fluid (cheapest that is compatible according to manufacturer specification is Pennzoil Synchromesh). During a clutch replacement/repair job at the dealership, I had them change transmission fluid (since I bought this jeep fairly recently and didn't know the last time it was changed). About a week later, I noticed transmission fluid slowly leaking from the front of the transmission (although the specific leak point was not obvious).

I'm not positive and cannot prove it, but my guess is that the dealership put in the wrong transmission fluid and that this caused the leak. I promptly drained the fluid and replaced with the Pennzoil Synchromesh, which is still leaking but at an even slower rate. I then tried adding some Lucas Transmission Fix, which seems to have actually worsened the leak. To further complicate the situation, the rubber boot at the base of my shifter (underneath the outer leather boot cover) has been eaten away and is basically just a sticky mess of greasy rubber and fluid of some sort (I'm assuming tranny fluid of course).

Long story short, does anyone have any ideas or suggestions on how to remedy this? Obviously I need to locate the cause of the leak, which I'm assuming is at one or more of the transmission seals that now need to be replaced? I also need to replace the rubber shift boot, but I don't want to do that only to have it eaten away by the fluid again... Any help on this would be greatly appreciated. I know that the dealership will deny putting in the wrong fluid, and I can't afford to pay for them to diagnose and fix the problem at present. Currently I'm just adding about 1/3rd a bottle of Pennzoil Syncrhomesh per month to 'top off' the transmission.

Thanks in advance. I'm obviously a new member and am looking forward to participating in what looks like a great forum!

nightop 12-20-2011 12:19 AM


Fuel 12-20-2011 03:53 AM

If that rubber boot is deteriorated at the top of the transmission, is the trans slinging oil out of there and its just running down the side of the transmission?

00tj2 12-20-2011 01:01 PM

I don't think the wrong transmission fluid is going to eat away seals and shifter sounds like the front output shaft seal might be going bad and the boot is also fuel stated,the fluid might also be leaking from just the shifter boot...check that first....

TJWenatchee 12-20-2011 01:11 PM

I would degrease/clean the transmission real good after you have changed the rubber seal at the top at the shifter tower. As others have mentioned if that is in poor shape it may be letting the transmission throw fluid out through the top and then it runs down the side.

nightop 02-19-2012 08:14 PM

I know this is a long delayed reply, but thanks for all of the advice/posts everyone. As many mentioned, the leak was in fact from the top of the transmission -- specifically, there was a small tear in the rubber seal on the top of the base of the shifter (located below both the outer and inner shift boots). I'm going to have to either buy a whole new shifter assembly or perhaps get a replacement seal from the local stealership.

In case anyone else runs into this problem or need to replace the inner shift boot (which in my case was collaterally damaged due to the shifter seal leak spraying tranny fluid onto the underside of the inner shift boot leading to the rubber turning into a gooey hole), the ONLY place I've been able to find a replacement part is here: Jeeps Are Us (warning -- some other members on the forum have had issues with buying from them)

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