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Discussion Starter · #1 ·
Hi guys.

Here is what keeps happening. It gets harder and harder to get into first gear, eventually it is impossible to get to first, then it gets harder and harder to get into second. Also, it grinds when i try to put it in reverse. Jeep has been to the shop once before for this issue and the mechanic replaced the clutch slave/master cylinder (i know nothing about the mechanics of a jeep, so I hope this is the correct terminology). Anyway, I picked it up last night and the issue was seemingly resolved, so i drove to work this morning and by the time I got here, it was doing it all again.

does anyone have any insight here?
 

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zombie & ninja slayer
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Fluid in tranny probably needs changed if it's a 00 or newer with a 5 speed and a 4.0. It HAS to have syncromesh fluid, when the fluid starts "wearing" out it causes hard shifting /grinding

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"When your stupid, your whole body suffers"
 

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Discussion Starter · #3 ·
Fluid in tranny probably needs changed if it's a 00 or newer with a 5 speed and a 4.0. It HAS to have syncromesh fluid, when the fluid starts "wearing" out it causes hard shifting /grinding

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"When your stupid, your whole body suffers"

it's a 99
 

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Discussion Starter · #5 ·
ok and now i just went out and tried it. pumped the clutch twice before I started it up, heard a click sound on the first pump, second pump was smooth, started it, and was able to get it in first and in reverse with no problem.

completely stumped..
 

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Discussion Starter · #6 ·
looks like im talking to myself, but i just took it for a spin and it seems fine.

pretty strange.
 

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Your issues are with the master and/or slave or something keeping the clutch from disengageing I see they fixed it so it may have a bad part. What is happening is in the forward gears have syncros which wont allow it to go into gear until they sync up. Which from a stop with the clutch released that will never happen. But if you turn the engine off so it allows them to sync it should go right into gear. Once you get it rolling same issue applies but if the rpms matches the vehicles speed it will go into gear its the syncros just prevent the grinding. Now with reverse that gear does not have a syncro to prevent it from grinding.
 

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x2 on Russ with the reverse gear. The reverse gear doesn't have a synchro so you can't put it in reverse on the highway by accident thinking you have a sixth gear. Putting the transmission into say first or third with the clutch in then going to reverse will stop that shaft in the transmission and will allow you to go into reverse without grinding.
 

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Discussion Starter · #9 ·
Your issues are with the master and/or slave or something keeping the clutch from disengageing I see they fixed it so it may have a bad part. What is happening is in the forward gears have syncros which wont allow it to go into gear until they sync up. Which from a stop with the clutch released that will never happen. But if you turn the engine off so it allows them to sync it should go right into gear. Once you get it rolling same issue applies but if the rpms matches the vehicles speed it will go into gear its the syncros just prevent the grinding. Now with reverse that gear does not have a syncro to prevent it from grinding.
since the master cylinder has been replaced and I am again having the issue, is there a pressure plate or something that could be causing the problem?
 

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since the master cylinder has been replaced and I am again having the issue, is there a pressure plate or something that could be causing the problem?
If it was just the master that was replaced its probably the slave. When you pump the clutch multiple times and the problem goes away it is most likely the slave cylinder on the tranmission. It is very rare for a clutch assembly to cause your issue. An easy way to see is chock you jeep set the brake crawl under it on the drivers side of the transmission you will see the slave cylinder have someone push the cluch and measure the throw then have him pump the clutch then measure again it. If it is out further than the first time its the slave. Also see if its slowly going back into its self or leaking.
 

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Discussion Starter · #11 ·
If it was just the master that was replaced its probably the slave. When you pump the clutch multiple times and the problem goes away it is most likely the slave cylinder on the tranmission. It is very rare for a clutch assembly to cause your issue. An easy way to see is chock you jeep set the brake crawl under it on the drivers side of the transmission you will see the slave cylinder have someone push the cluch and measure the throw then have him pump the clutch then measure again it. If it is out further than the first time its the slave. Also see if its slowly going back into its self or leaking.
im looking at the paperwork from the shop. He replaced the "clutch master/slave cylinder + lines assembly.
 

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Jason you have the AX15 5 speed transmission in your Jeep. They are known for having synchronizer issues. There are some threads that detail how to drain, clean and refill your transmission with the royal purple syncromax or (redline MTL 90) . I have done the same and it gave me a few thousand miles extra on the transmission, but I was way late in the game when I did my flush. I'll see if I can find a link and post it up here.

Mud
 

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I couldn't find the specific link I was looking for so here is what I did.

1) drain old fluid
2) Use kerosene or diesel ( I used diesel) and fill to proper level in transmission.
3) With transfer case in neutral I started the motor and ran through all 5 gears not more then 1 minute total.
4) Shut down motor drain diesel from transmission let it drain for an hour to get it all out.
5) Refill with Redline Or syncromax.
6) Drive as needed for fun and stress relief.

I saw a significant improvement in shifting after the flush but I already had major issues with the tranny it's still going but I'm in need of a new one.
 

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im looking at the paperwork from the shop. He replaced the "clutch master/slave cylinder + lines assembly.
So the best thing to do is get under it and look. See if it is working or call the shop it sounds like it is not working right

The big thing is it grinds going into reverse which means the transmission isn't disengaging all the way.
 

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So the best thing to do is get under it and look. See if it is working or call the shop it sounds like it is not working right

The big thing is it grinds going into reverse which means the transmission isn't disengaging all the way.
wrong. reverse doesnt have synchronizers like the rest of your gears have. These synchros, synchronize your gears to spin the same speed, allowing them to mesh.

To prevent the grind when you go into reverse, push the clutch in, shift into first, take it out of first and shift to reverse. then release clutch.
 

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wrong. reverse doesnt have synchronizers like the rest of your gears have. These synchros, synchronize your gears to spin the same speed, allowing them to mesh.

To prevent the grind when you go into reverse, push the clutch in, shift into first, take it out of first and shift to reverse. then release clutch.
If you read the op the grind he is getting is not the quick grind you get when you shift into reverse after clutching. It is grinding alot which is because it has no syncros. It also has trouble shifting into the forward gears but not grinding that is because the syncos prevent it from grinding but it wont allow it to go into gear. If you have a 5 speed try shifting it with clutch out it wont go into forward gear then try shifting into reverse and it will grind like hell. So read the whole posting before attacking me on being wrong his issues are behaving like the clutch is still engauged.
 

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If you read the op the grind he is getting is not the quick grind you get when you shift into reverse after clutching. It is grinding alot which is because it has no syncros. It also has trouble shifting into the forward gears but not grinding that is because the syncos prevent it from grinding but it wont allow it to go into gear. If you have a 5 speed try shifting it with clutch out it wont go into forward gear then try shifting into reverse and it will grind like hell. So read the whole posting before attacking me on being wrong his issues are behaving like the clutch is still engauged.
The shifting into a forward gear with no clutch is possible. I can do it parked (not running) and I can do it while driving..I shift quite a bit without clutch when moving. You have to use the clutch to start rolling yes
 

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The shifting into a forward gear with no clutch is possible. I can do it parked (not running) and I can do it while driving..I shift quite a bit without clutch when moving. You have to use the clutch to start rolling yes
I was talking about when its running but it sounds like you caught my drift;)

So we agree on the fact that the op clutch probably not fully disengauging causing it to have problems shifting and getting into gear. Right?
 
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