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Unread 02-26-2011, 05:51 PM   #1
Tdaz250
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Transmission drip

Hey all. My zj has a little transmission drip...not sure what it's from but the pan is wet with fluid. It's only a few drips and I check the level pretty regularly just in case it gets low.

Anyways I'm curious what the common leak places are. I'm thinkin it's the tranny pan gasket but I've read other stuff where it's between the t case and the tranny...stuff like that.

I'd just like to get it fixed so it's one less thing to worry about. Not enough to take it in cause I'll just add fluid every once and a while but if it's something small I can fix then I'll do it.

It's got 179k on the clock. The PO said it was rebuilt.

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Unread 02-26-2011, 10:24 PM   #2
KJK
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You're going to have to clean it off well and then watch it to see where the drip starts from. It's the only way.
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Unread 02-28-2011, 02:29 PM   #3
Tdaz250
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Quote:
Originally Posted by KJK View Post
You're going to have to clean it off well and then watch it to see where the drip starts from. It's the only way.
I'm gonna do this next time its a nice day out, but i'm also looking for what common causes are for a small leak on the ZJ's
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Unread 02-28-2011, 03:25 PM   #4
KJK
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Either the rear trans. seal (at the joint connected to the transfercase), or the pan gasket (maybe one or more bolts are loose). On the driver's side above the pan where the gear selector enters the case, or where the wire harness connects.
All of these may leak or seep trans. fluid (at least mine has at one time or another).
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Unread 02-28-2011, 04:25 PM   #5
Candymancan
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Could be the NSS, a sensor on the drivers side above the pan near the drive shaft it has a 3 wire plug. Stick a rag in between it and check it a few hours or overnight to see if fluid is on the rag. If there is this switch could be leaking.

Both our Jeeps were leaking from this.

http://i1083.photobucket.com/albums/...2/HPIM1664.jpg
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Unread 04-09-2011, 12:36 PM   #6
StidgeInTN
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Quote:
Originally Posted by KJK
Either the rear trans. seal (at the joint connected to the transfercase), or the pan gasket (maybe one or more bolts are loose). On the driver's side above the pan where the gear selector enters the case, or where the wire harness connects.
All of these may leak or seep trans. fluid (at least mine has at one time or another).
About these bolts being loose, i've had to tighten mine 2x since my last trans fluid change about 750 miles ago. Is this a common problem or could i use thread locker on it?

BTW-sorry for thread stealing but can't find any thing about when i search.
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Unread 04-09-2011, 12:59 PM   #7
Candymancan
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Common places are what people mentioned.

Neutral Speed Sensor which is by the front drive shaft on the side of the transmission above the pan. My 5.9 was leaking out of this sensor and it was leaking really really bad. I thought originally it was the transmission pan, so i changed the gasket and it didnt fix it until i found out it was the sensor.

It seems its very common to leak at this sensor on these Jeeps. i found alot of talk about it, and our 4.0 is doing it now also

The transmission pan bolts go into an alluminum tranny case... Dont use thread locker unless its the blue stuff so you can get the botls out easily.. Otherwise red thread locker = stripped bolt threads. Personally i wouldnt use any kind of thread locker on the transmission bolts
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Unread 04-09-2011, 02:28 PM   #8
StidgeInTN
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Think i may have found my problem. Bad tranny mount = vibration = bolts coming loose. Time to do some work!
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Unread 04-13-2011, 05:45 PM   #9
StidgeInTN
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Quote:
Originally Posted by Candymancan
Common places are what people mentioned.

Neutral Speed Sensor which is by the front drive shaft on the side of the transmission above the pan. My 5.9 was leaking out of this sensor and it was leaking really really bad. I thought originally it was the transmission pan, so i changed the gasket and it didnt fix it until i found out it was the sensor.

It seems its very common to leak at this sensor on these Jeeps. i found alot of talk about it, and our 4.0 is doing it now also

The transmission pan bolts go into an alluminum tranny case... Dont use thread locker unless its the blue stuff so you can get the botls out easily.. Otherwise red thread locker = stripped bolt threads. Personally i wouldnt use any kind of thread locker on the transmission bolts
Right again there Candyman. My leak is coming from NSS. Thanks for the insight.
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Unread 07-24-2011, 03:40 PM   #10
Tdaz250
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To give a conclusion to my problem it ended up being the transmission bolts were loose. About half I could give a full ratchet turn to them. I tightened them up cleaned up the pan...made it drip alot less then I got under again, this time pulled them really tight and it hasn't leaked since.
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Unread 07-24-2011, 06:42 PM   #11
Candymancan
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carefull making them REALLY tight, they are only suppose to be at around 18 ft lbs i believe, which isnt that tight
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Unread 07-24-2011, 08:18 PM   #12
Tdaz250
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I went under again just to check on it and(today) and they were loose again...not bad...bout a 1/4 a turn on my ratchet. No drips...but I have to wonder why it keeps getting loose
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Unread 08-14-2011, 09:20 AM   #13
Tdaz250
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I think i'm going to run and get some lock-tite today for these bolts. I tightened the bolts...look under there 3 or 4 days later(after wiping the pan clean) and its wet and the bolts are loose agian. Not dripping like it was before but i want to get it done and not worry about it.
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