Author Topic: Changing rear tcase seal..... bushing?  (Read 7086 times)

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Complete Loser

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Re: Changing rear tcase seal..... bushing?
« Reply #15 on: March 27, 2010, 12:20:54 PM »
Well, i had a stroke of good luck for a change. A buddy stopped by and had a tailshaft housing in his truck toolbox. Been there for years. lol

This is where the luck wears off im afraid.
I immediately seen a problem. The mating surface of the tail shaft has a protruding lip that would probably fit inside the tcase a little bit. Yet my bearing is flush. Not recessed inside the tcase. ?
Heres a photo to help. I forgot to rotate the photo.


The tailhousing that i took off (which is beat pretty bad) i noticed the rednecks ground off the lip, so it would mate up the tcase flush.

Anyone know whats up here? Do i just need to drive this output shaft bearing in deeper?
My Tcase tag says NP231
The housing my buddy dropped off today came off a np207? i think he said.

Whew.... this is fun.

Offline sharpxmen

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Re: Changing rear tcase seal..... bushing?
« Reply #16 on: March 27, 2010, 12:48:19 PM »
why not wait for the one Bounty sent over

btw, that bearing needs to be replaced. If i were you i'd look for another t-case (rather than rebuilding this one)
'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Offline FourbangerYJ

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Re: Changing rear tcase seal..... bushing?
« Reply #17 on: March 27, 2010, 12:53:34 PM »
why not wait for the one Bounty sent over

btw, that bearing needs to be replaced. If i were you i'd look for another t-case (rather than rebuilding this one)

Or do a SYE.
Scott~

Using tools you have not used in a while is like shaking hands with old friends. :nod:

Complete Loser

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Re: Changing rear tcase seal..... bushing?
« Reply #18 on: March 27, 2010, 01:04:52 PM »
What is SYE?

Im under the assumption that this is the correct tailshaft for this tcase. Same one as came off of it. And was told interchangable with 207.
So i assume the one Hunter has kindly sent is the same aswell.
But i could be wrong?

Why bearing need replaced?

Complete Loser

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Re: Changing rear tcase seal..... bushing?
« Reply #19 on: March 27, 2010, 01:58:49 PM »
SYE= slip yoke eliminator.  Figured it out.  :thumb:

Offline sharpxmen

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Re: Changing rear tcase seal..... bushing?
« Reply #20 on: March 27, 2010, 02:39:49 PM »
surface rust on bearing + balls don't mix well - it will slowly break down the rolling surface.

and that might be the case inside the case as well. I would guess it's noisy already and probably there's quite a bit of play in the bearing - that might be the reason of your bushing and seal coming out and you most likely had vibrations. It will happen again.
'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Complete Loser

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Re: Changing rear tcase seal..... bushing?
« Reply #21 on: March 27, 2010, 02:50:03 PM »
Im pulling the bearing housing now. Just getting ready to look for the online manual how to. I pulled the speedo part so far. Letting fluid drain.

Complete Loser

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Re: Changing rear tcase seal..... bushing?
« Reply #22 on: March 27, 2010, 03:43:22 PM »
Ok. I think i can confirm on my own that the 207 rear housing wont work (with out mod) on a 231. The bearing (as seen in the picture) is installed all the way (near as i can tell now that ive pulled the bearing housing).
So, i will be waiting on the housing Bounty shipped.

Getting to look inside, i think i can see whats going on now. As much as i hate to admit it, i think i put the water in the tcase (the few oz's that drained out originally).
When i first got this jeep, i had to pull it into the garage. And, well i had to take a couple laps in the snow first. Going in reverse in 2-3ft deep snow, with a destroyed rear seal would most likely put snow in there. You will notice in this pic, the orange color around where the rear output bearing would be.
Thats exactly as Sharpy suggested. Rust. But upon further inspection, the inside looks amazing, the rust trail goes no farther. No rust on anything. There is some decent condensation on the ceiling of the inside of the tcase. What water is condensating in there, is beading up very well. And i cant find any evidence of a long presence of water. So my guess is, i packed the tail shaft with snow, as well the bearing, and parked it. As she sat, she rusted up a bit.
Also, there is or was no milky oil to indicate a thorough mixing of water with the innerds.

I have my heat gun blowing inside the tcase right now to evap the rest of the water condensation, while im taking a break.

I will put about 5 minutes of 4L time on the tcase once i get her rolling, and change the fluid again. And inspect the old fluid.



« Last Edit: March 27, 2010, 03:44:54 PM by Complete Loser »

Offline sharpxmen

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Re: Changing rear tcase seal..... bushing?
« Reply #23 on: March 27, 2010, 04:30:26 PM »
inside looks good - i still think you should replace that bearing (wait for the shipping from Bounty, you might get lucky and get the bearing with the housing)
'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Complete Loser

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Re: Changing rear tcase seal..... bushing?
« Reply #24 on: March 27, 2010, 04:33:30 PM »
ya. im gettin ready to order a bearing. what source you usually use for those type parts? quadratec?
I might as well get a snap ring also.

The oil pump looks great also. Do these commonly go bad, or wear out?
This one seems to function ok in hand at least.
« Last Edit: March 27, 2010, 04:39:34 PM by Complete Loser »

Offline sharpxmen

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Re: Changing rear tcase seal..... bushing?
« Reply #25 on: March 27, 2010, 07:29:28 PM »
ya. im gettin ready to order a bearing. what source you usually use for those type parts? quadratec?
I might as well get a snap ring also.

The oil pump looks great also. Do these commonly go bad, or wear out?
This one seems to function ok in hand at least.


quadratec is good, morris4x4 also good and i did find http://www.rockauto.com/ to be cheapest on some of the bearings (got my special order bearings for my lockers from them, about 1/2 price compared to 4wd.com).
'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Offline Bounty Hunter

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Re: Changing rear tcase seal..... bushing?
« Reply #26 on: March 28, 2010, 06:46:46 AM »
Looking at your pic, doesn't look half bad but I don't see the upper plastic pad on the shift fork, where it engages the shift collar.  The blue pad looks okay, but there should be a white plastic pad on each tip of that shift fork.  Inspect it closely, maybe it's there and I can't see it in the pic.

You can't use 207 parts on a 231, they're not interchangeable.  I sent you a 231 tailcone.  I did not send a tailhousing that contains the bearing.  You can take the old bearing to any autoparts store and they can cross-reference the number on the bearing to get you a new one.

I can talk you through anything you need to know about a 231.

Complete Loser

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Re: Changing rear tcase seal..... bushing?
« Reply #27 on: March 28, 2010, 09:40:50 AM »
thanks bounty. I will have a closer look. :)
Ordered bearing and snap ring already. :)

Offline Bounty Hunter

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Re: Changing rear tcase seal..... bushing?
« Reply #28 on: March 28, 2010, 11:19:07 PM »
If the plastic bushing is gone, you may get lucky and not damaged the fork or collar yet. 

The pump should be fine as long as there's no metal floating in the fluid and everything looks okay.  Clean the pickup screen well, would be worthwhile to pull the rear case half and do that.

Complete Loser

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Re: Changing rear tcase seal..... bushing?
« Reply #29 on: March 28, 2010, 11:41:20 PM »
I will pull the case half and have a look.  :brick: 
Now im gonna have to buy more anerobic sealer.  :weee: Wish that crap was cheaper.