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Unread 01-11-2014, 05:56 PM   #1
Yjflexxer
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Location: Louisville, Ky
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YJ transmission problems.

New to this forum, Ive searched quite a bit before making this post and I'm fairly certain my problem is a failing master or slave cylinder.

First off its a 95 Jeep YJ with the original (I presume) ax-15 tranny with about 160k on the clock. Anyways, about Monday I started noticing it was getting kinda difficult to get into second gear while downshifting. Not grinding, just wouldn't go into gear without really muscling it in. By Thursday first and second gear were extremely hard to get into while shifting up or down. Friday on the way to work it was doing it in every gear for the most part and popping out of lower gears while up shifting as if the clutch wasn't engaging completely and ended with the tranny getting stuck in 4th while downshifting. The shifter seemed to be in the neutral position. It came out of gear once we started pulling it up on the tow truck.

Today I changed the tranny fluid and it was pretty dark with some brass shavings (third gear synchros were out already and would grind slightly until about a week ago when it would pretty much just not go in without muscling it in as well as other gears). I also inspected the firewall inside and out around the clutch master cylinder and didn't see anything worth mentioning. I visually inspected the slave and didn't see anything unusual. I'll pull it off and make sure its working correctly when i get another day to work on it. I inspected the shifter linkages as best i could and didn't see anything bent or disconnected. I also started the truck and put it in fist gear with the clutch peddle on the floor, gave it some throttle and got no movement in first or reverse. Clutch is relatively new according to the previous owner and feels fine and makes no unusual noises.

Im just wanting some input on ideas, as I said I think the problem is a failing master or slave cylinder, either that or synchro or a clutch/bearing problem, but I have a hard time believing I lost all the synchros in under a week. I've seen master cylinders leak internally and hold no pressure, Im hoping that could be my problem.

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Unread 01-11-2014, 06:24 PM   #2
jokerchief462
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Go to Rock Auto and order both with the line pre- bled and install. They are both old and need to be replaced. 30-45 minute job and your done.

If you replace one and not the other more likely the problem will come back

Sent from underneath my Jeep
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Unread 01-11-2014, 07:37 PM   #3
Yjflexxer
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Thanks for the imput, that was the first thing i was going to do.
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Unread 01-12-2014, 05:40 AM   #4
kloppk
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Sounds like you did your homework. Congrats!
I agree with jokerchief462. I suspect you master is leaking internally.
Hopefully your synchros are still good enough.
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Unread 01-12-2014, 05:36 PM   #5
Yjflexxer
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Thanks, I try to be as thorough about things before I go making post on forums. I just ordered the DORMAN pre bled kit. Seems they make good parts.
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Unread 01-20-2014, 05:21 PM   #6
Yjflexxer
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Update on this. I replaced the clutch master and slave cylinder with a pre bled kit off rock auto and it seemed to fix my problem. I do still get some "bumping" for lack of a better word type of feedback occasionally when trying to shift up and it still has a hard time downshifting into third. It doesnt grind anymore, it just wont go sometimes. Im thinking this transmission may be on its way out and its just the wear and tare its had over the years at this point. In the meantime ill watch the fluids and try to prolong its life as long as possible. Ive read the recommended trans fluid isn't good on the synchros and people are running 5w30 motor oil. Can anyone confirm this? Perhaps i should run that or some mt-90, currently i just have the recommended stuff.
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Unread 01-20-2014, 09:10 PM   #7
bigbossd1030
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Quote:
Originally Posted by Yjflexxer
Update on this. I replaced the clutch master and slave cylinder with a pre bled kit off rock auto and it seemed to fix my problem. I do still get some "bumping" for lack of a better word type of feedback occasionally when trying to shift up and it still has a hard time downshifting into third. It doesnt grind anymore, it just wont go sometimes. Im thinking this transmission may be on its way out and its just the wear and tare its had over the years at this point. In the meantime ill watch the fluids and try to prolong its life as long as possible. Ive read the recommended trans fluid isn't good on the synchros and people are running 5w30 motor oil. Can anyone confirm this? Perhaps i should run that or some mt-90, currently i just have the recommended stuff.
10w30
That's what I use and many others.
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Unread 01-20-2014, 09:19 PM   #8
GrantYJ
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Quote:
Originally Posted by Yjflexxer View Post
Update on this. I replaced the clutch master and slave cylinder with a pre bled kit off rock auto and it seemed to fix my problem. I do still get some "bumping" for lack of a better word type of feedback occasionally when trying to shift up and it still has a hard time downshifting into third. It doesnt grind anymore, it just wont go sometimes. Im thinking this transmission may be on its way out and its just the wear and tare its had over the years at this point. In the meantime ill watch the fluids and try to prolong its life as long as possible. Ive read the recommended trans fluid isn't good on the synchros and people are running 5w30 motor oil. Can anyone confirm this? Perhaps i should run that or some mt-90, currently i just have the recommended stuff.
If you contact Chrysler, you'll find out that the 5w30 motor oil that people are recommending is what Chrysler/Jeep recommends now as well.

Time to go buy some oil.
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Unread 01-20-2014, 09:27 PM   #9
bigbossd1030
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http://www.jeepforum.com/forum/f12/r...np231-1456939/
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