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Old 05-03-2009, 03:32 PM   #1
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Need some transmission help (ax15)

So my throwout bearing sounded like it was going bad, and became real noisy. And I also had some problems with my tranny grinding when I would shift into second or downshift into second. Figured this was a symptom of the bearing going bad.
I went and picked myself a LUK clutch set. Replaced everything, and had flywheel cut. Put it all back together. Everythings great but it still grinds second everynow and then. It usually will shift fine from 1st - 2nd under easy driving, but if I'm trying to get up to speed and switch fast, or if I downshift from 3rd, or into second from neutral.
The odd thing is....it never did this grinding crap until the throwout bearing starting going bad. Now its still doing it.

Any ideas of what may be causing this. I hope I dont need a whole new tranny or have to start replacing gears.

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Old 05-03-2009, 07:52 PM   #2
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The syncro's are just not meshing all the way. Little grind here and there never hurt anybody. Some say double clutching but that is a myth. The minute they made syncroed trannys double clutching just makes you look kinda like a idiot driving! You will not need a new tranny until you can't use that gear. I have seen that many times before too, a friend lost the syncro's to 2 gears on that shaft 1st and reverse it was damn funny to see him park!! Just keep driving it.

Thinking about it, see if JPDOCDAVE, Jerry Bradsford know how to adjust the tj clutch. That could be it too. Not fully disengaging the motor.

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Old 05-03-2009, 08:13 PM   #3
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Its a little more then "here and there" though...thats what gets me nervous. I remember before I did the clutch I was on a 5-6 hour trip and by the end of the trip it grinded pretty much everytime.

Now, I've only had the jeep all back together for a day since doing the clutch work, but as soon as it started the grinding crap, I was like WTF! I just did all this work and I still have this problem. I wanted to drive into a tree.
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Old 05-03-2009, 08:29 PM   #4
Knows a couple things...

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The clutch is not adjustable. It sounds to me like your tranny is just getting tired, perhaps one or more of the synchros is starting to get lazy. What kind of gear lube is in there? A very good lube that sometimes (!) helps with AX-15 shifting issues is Redline MT-90. MT-90 won't perform miracles though.

By the way, though it's too late for you, for others installing a new clutch the TJ's flywheel should not be turned ("cut") when installing a new clutch... this is right out of the FSM. The flywheel has a small dome shape on its surface and turning it on a lathe will remove that dome that helps smooth clutch engagement. At most, again per the FSM, any glazing on the flywheel surface should only be lightly sanded off with a mild grade of sandpaper or emory cloth.
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Old 05-03-2009, 09:09 PM   #5
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Quote:
Originally Posted by Jerry Bransford View Post
The clutch is not adjustable. It sounds to me like your tranny is just getting tired, perhaps one or more of the synchros is starting to get lazy. What kind of gear lube is in there? A very good lube that sometimes (!) helps with AX-15 shifting issues is Redline MT-90. MT-90 won't perform miracles though.

By the way, though it's too late for you, for others installing a new clutch the TJ's flywheel should not be turned ("cut") when installing a new clutch... this is right out of the FSM. The flywheel has a small dome shape on its surface and turning it on a lathe will remove that dome that helps smooth clutch engagement. At most, again per the FSM, any glazing on the flywheel surface should only be lightly sanded off with a mild grade of sandpaper or emory cloth.
so Jerry will anything bad come out of having that flywheel done?
What do you suggest besides changing that fluid in there to help out my tranny?
Im gonna drain that thing this week and fill it up with the redline.
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Old 05-03-2009, 11:10 PM   #6
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draining and replacing the fluid is the only thing you can do for it short of tearing it down and replacing the worn synchros. i would just drive it until you cant get it into second anymore then replace it. you can find a low mile used ax15 cheap and since you just did the clutch you already know how to replace it. i doubt you will have any problems with your flywheel, it just might engage a little different now.
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Old 05-03-2009, 11:59 PM   #7
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Hey man,
Mine has been grinding going into second for atleast a year now. It happens. It is the most common gear to wear out first. You can try shifting into second slower and change the tranny fluid, but it happens.
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Old 05-04-2009, 10:43 AM   #8
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I've been thinking about picking up a cheap, used ax15 from a junk yard and rebuilding it over some time. Im gonna research it a little more and see whats involved.
This way when its time for the new tranny, maybe I'll have one all new and ready.
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Old 05-04-2009, 12:13 PM   #9
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If your gonna do that try and get something stronger. There are a ton of good trannies that should easily built in you jeep.

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