Trail trans trouble - JeepForum.com
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post #1 of 27 Old 09-25-2017, 06:31 PM Thread Starter
darksidejeeptj
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Trail trans trouble

Long story short "most difficult" course called black gulch ridge difficult section and started having sudden transmission issues.

Went to downshift and was greeted with a terrible screeching squealing almost belt like sound when I depressed the clutch pedal coming from trans or bellhousing I think.

Coasted to stop let clutch out and noise stopped mostly (slight grinding noise can be heard suddenly at idle) and clutch movement feels notchy and rough also suddenly.

Makes noise in neutral at a stop idling the instant clutch is depressed slightly or all the way.

Same in 4 or 2 wheel drive, same with transfer case in neutral and trans in gear.
Fluids all good and changed recently.

It also slightly drops the rpms slightly when doing this screeching.
Throwout bearing or input shaft I've read but want 2b sure.
1998 jeep tj 4.0 manual 145k lifted 35's trans rebuilt at 139k previous owner

Recently replaced master cylinder and retained slave cylinder if thats relevant.

THANK YOU EVERYONE

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post #2 of 27 Old 09-25-2017, 06:34 PM Thread Starter
darksidejeeptj
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Trail was super rough nearly rolled twice if that has anything to do with anything also.

Roughest trail I've had Clifford on since owning it.
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post #3 of 27 Old 09-25-2017, 06:38 PM
jeepinjoeu
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Sounds like a throwout bearing to me, might as well replace the clutch while you're there.

2001 TJ, 4.0, Auto, 35's, Locked Dana 44's, 5.38s, Atlas 2
I want more wheelbase...
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post #4 of 27 Old 09-25-2017, 06:45 PM Thread Starter
darksidejeeptj
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Is there a way to be certain??

My experience with Throwout bearings is sound stops the instant clutch is depressed at all, but mine does the opposite.

The screeching starts with clutch depressed.
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post #5 of 27 Old 09-25-2017, 06:59 PM
mukluk
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The problem comes and goes dependent upon you pushing the clutch pedal in or releasing it; I'd wager a 95% chance it's the throwout bearing, but a 100% chance you're going to have to remove the transmission to find out for certain and fix it. As already recommended, change the whole clutch out while you have it apart.

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post #6 of 27 Old 09-25-2017, 07:01 PM
jrallen
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A throwout bearing has pressure on it when you depress the clutch pedal as it pushes against the fingers on the pressure plate. When a throwout bearing has lost the ball bearings inside of it (which is how almost all of them fail), you have a metal ring spinning on the front of a metal bearing with no balls in between. That's where the screeching of a bad throwout comes from. So yes, you have a bad throwout bearing. Replace it with a Luk clutch kit, which is OEM, and you'll be good to go.

LuK 05-065 Clutch Kit https://www.amazon.com/dp/B000CICYZ4..._aBAYzbR47K3G4
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post #7 of 27 Old 09-25-2017, 08:21 PM Thread Starter
darksidejeeptj
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Thanks for the responses and that clutch link great price!

I've never torn into a trans before, will I be able to tell once pulled and torn apart for certain that the input bearing is not the culprit vs TO bearing? Spin either by hand for example? The ball bearings coming out described above sounds easy to visually see.

I'm shopping for a tans jack adapter tonight for my floorjack.


ALSO any advice tips or tricks for this job? Anything else to check or do while apart??
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post #8 of 27 Old 09-25-2017, 09:33 PM
jrallen
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You'll want an actual transmission jack if you can find one because you'll be pulling the trans and tcase together. The $80ish harbor freight trans jack is surprisingly adequate for anyone doing the job away from a professional setting. If you were using it everyday it'd wear out quite quickly, but most people won't be pulling a trans more than once or twice in their life so it's more than good enough. You'll also need an E12 external torx socket to remove the top two bellhousing bolts, and a long 24-36" 3/8" extension would be very helpful as well. On every TJ trans I've pulled, I replace the E12 bolts with standard hex head bolts. They are 3/8-16 thread, and 1.75" long. You'll thank yourself if you ever have to pull your trans again in the future.

As to confirming what's actually damaged once you get the trans out, look at the new throwout and look at the old one. You'll definitely be able to see if the old one is bad because they typically fail pretty catastrophically. If yours looks completely fine, you'll need to remove the input bearing retainer and have a look at the input bearing. Normally you'd be able to visually confirm if it's good or not as well.
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post #9 of 27 Old 09-25-2017, 11:21 PM
Mousejockey
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Why pull them together?
I just pull the transfer, then the trans
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post #10 of 27 Old 09-26-2017, 05:15 AM
jrallen
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Quote:
Originally Posted by Mousejockey
Why pull them together? I just pull the transfer, then the trans
I suppose you can do it that way, but why? Unless you're putting in an SYE as well, it's just extra work you've created for yourself. Get a good jack and it's very easy to pull them both together.
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post #11 of 27 Old 09-26-2017, 09:16 PM Thread Starter
darksidejeeptj
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So a trans jack adapter like attached pic is not up to the task?

Luk clutch kit ordered

Got some snap ring pliers and an inverted torx head socket for those top bolts someone mentioned

THANK YOU to all
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post #12 of 27 Old 09-26-2017, 09:21 PM Thread Starter
darksidejeeptj
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I also believe I have a small oil leak from between the trans and t case so maybe pulling them separately and fixing the leak in process is a good idea?
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post #13 of 27 Old 09-27-2017, 07:46 AM
NotURMailman
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If you have to split them anyway you don't need a trans jack.
Drain them both.
Then drop the t-case.
Then lay under the trans and slide it back and lay it on your chest.
It's not really that heavy.


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post #14 of 27 Old 09-28-2017, 06:42 PM Thread Starter
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??
Im 6'8" & 245 but that still sounds questionable bench pressing my ax15 transmission down onto my chest even without transfer and fluids..

Is there any other repair maintenance I can do with t case or trans pulled and accessible?

I plan to replace the clip on the clutch fork that holds it to the pivot ball.

Having never pulled a trans anything to take care of or with to not cause headache during work?
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post #15 of 27 Old 09-28-2017, 06:57 PM
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You could fill in your profile to help others help you with any future questions you may have...
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