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Old 05-18-2013, 09:09 AM   #1
Join Date: May 2013
Location: Tyler, TX
Posts: 265
General ?'s with my np231/tf999 stop leak mission

Here is a little background, I bought my YJ a couple of weeks ago from the original owner. The body is very clean and low mileage considering the age. I knew it was leaking ATF when I purchased it and I could see it weeping from between the tcase/trans. Now I am going through it and found a few little surprises that I am going to correct. I pulled the tcase last night and ATF spilled out from where the trans/tcase met so I am going to replace these two seals to fix that. I also noticed that it is bleeding from the trans shift lever seal. ATF is all over the place, the wind must blow it everywhere. I also discovered that the passenger side carpet is soaking wet, probably from the A/C, but that project will be another day. Now for the questions.

1.) Does anyone know the Napa or Autozone part number for the trans(tf999) rear seal, np231 input shaft seal, and the tcase pinion seal for the front drive shaft? I am so tired of the guys at the part store giving me the wrong seals and I have to drive back.

2.) What is the torque spec for the tcase drain and fill plug? It uses a 30mm socket.

3.) The trans has two bolts that mount it to the trans mount on the skid plate, but wait my YJ didnt have these bolts. Does anyone have a manual or know what size these bolts were from the factory?

4.) Is the trans shift selector seal something a local parts store will have or should I go ahead and order online and wait? If someone purchase from parts store do you have part number? Again I have had bad luck with the parts counter people giving me the wrong seal. I think it's happened three times now.

5.) What is the torque spec for the tcase/trans mating bolts?

6,) What type of fluid was factory spec for the Tcase and tf999? I googled it and found people using different fluids.

I appreciated any help. Let me know if more info is needed.

1989 YJ, 4.2/TF999
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Old 05-18-2013, 10:36 AM   #2
AllMudd's Avatar
Join Date: Apr 2013
Location: SoCal
Posts: 1,268
For the wetness on the pass. carpet, it might be a heater core leak. Try and smell the fluid and if it smells like antifreeze that's what it is. The heater core is right there under the dash. The A/C should never make a carpet wet in any vehicle. They have condensation drains on them that allows the liquid to fall onto the ground. I'm leaning towards heater core. As far as the seals sorry I don't know, torque specs not sure I am a firm believer in the German specs for most bolts. There are some I deff. Hit with the torque wrench, clutch components and engine components.

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Old 05-18-2013, 10:51 AM   #3
Join Date: May 2013
Location: Tyler, TX
Posts: 265
Thanks for the response. The liquid looks clear with no greenish tint. I don't know if the AC was installed by Jeep or was a dealer installed option. I have the carpet out to see where it is coming from. I will keep a close eye on the heater core area.
1989 YJ, 4.2/TF999
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