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Old 02-20-2014, 02:18 PM   #1
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Clutch issues

Hey everyone.

I bought my 1995 Sahara (4.0 5 speed) in August and its been running great since I bought it. The past week or so the shifting has seemed rough. When I'm trying to back out of my driveway, I sometimes can't get into reverse without it grinding the first couple times. Also the past couple days me and my dad have both noticed it being tough to get into 1st and 2nd gear, almost like you have to push the clutch as far back as possible. I've read some other threads and read that it could be the slave cylinder? Any tips of what we can do to diagnose the problem?

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Old 02-20-2014, 02:29 PM   #2
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Sounds ike a synchronizer issue more than clutch. Check if you have break fluid leaking from the bellhousing, or if you master is leaking under the dash where the pedal meats the master cylinder rod. Also does your master need to be topped off regularly? If there's no leaking, I'd say syncro's are shot.

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Old 02-20-2014, 02:42 PM   #3
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what exactly entails in a synchronizer replacement? Is it each gear?
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Old 02-20-2014, 03:11 PM   #4
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I would try bleeding the clutch. Brake fluid used in clutches breaks down, absorbs water and can cause the problems you are complaining about. I would check that first. The clutch could also be bad and is not fully releasing. Synchros are certainly a possibility however I would bleed the clutch first.

In order to access the synchros you'd have to pull the transmission, at that point you'll know if the clutch is good or bad too. If you dig in that deep I'd replace the clutch too. Synchro replacement is not something that is easy to do for someone who has never done it. Honestly I don't think that's your problem.
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Old 02-20-2014, 03:25 PM   #5
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I honestly have no mechanic background, but I've been trying to learn a bunch of things with every repair the Jeep has needed so far. Me and my dad will dig into it soon and hopefully we can find the problem
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Old 02-20-2014, 03:57 PM   #6
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Good luck! Report back.
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Old 02-20-2014, 04:28 PM   #7
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Example: If you come to a stop sign, come to a complete stop then try to put it in first. Is it hard to shift into first? Do you have to force the shifter into gear?
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Old 02-20-2014, 06:35 PM   #8
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Yes. But once the Jeep is running for about 20 minutes or so (warms up), it shifts less roughly (closer to smoothly)
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Old 02-20-2014, 06:44 PM   #9
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try doing an oil change in the transmission. Use a lighter grade oil, or synthetic is what I use. It will make a big difference.

I fought the winters of Nia/Buff for 10 years with a tractor trailer every day. I know what you are going through. You must be in the grand island area?

Anyway, these older machines need to warm up before they will work right, but the synthetic lube will help.
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Old 02-20-2014, 06:47 PM   #10
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Quote:
Originally Posted by markgrozYJ View Post
Yes. But once the Jeep is running for about 20 minutes or so (warms up), it shifts less roughly (closer to smoothly)
Cold weather has an effect on shifting the transmission until the fluid heats up a bit. Notchy [sp] shifting is not uncommon in cold weather, especially in standard transmissions that use gear oil vs. ATF. Does it grind going into first or reverse all of the time? That can also be caused by contaminated brake fluid in the hydraulic clutch system. Have you checked the fluid level in the transmission yet? Switching the transmission over to synthetic fluid helps in very cold conditions. This can also be the nature of the beast for your Jeep in the dead of winter. I had a truck with a stick that was difficult to shift in extreme cold, once it heated up a bit it was fine.
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Old 02-20-2014, 06:49 PM   #11
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Sounds like a slave or master problem not a trany, Reverse has not got Synchros so if hard then, the clutch plate is not fully disengaging.
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Old 02-20-2014, 07:29 PM   #12
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Quote:
Originally Posted by demarpaint View Post

Cold weather has an effect on shifting the transmission until the fluid heats up a bit. Notchy [sp] shifting is not uncommon in cold weather, especially in standard transmissions that use gear oil vs. ATF. Does it grind going into first or reverse all of the time? Switching the transmission over to synthetic fluid helps in very cold conditions. This can also be the nature of the beast for your Jeep in the dead of winter. I had a truck with a stick that was difficult to shift in extreme cold, once it heated up a bit it was fine.
When it was really cold I did notice it being tough to shift. The past few days though have actually been the warmest in a while (30-50 degrees) so it actually caught me by surprise that it was still tough to get in gear. And it's not always that I have trouble with reverse, only when I try to back up right after starting the Jeep. Let's say I try using reverse once I get to my destination, it usually works fine
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Old 02-20-2014, 07:57 PM   #13
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Don't just piss off money on parts you don't need, find out what's wrong, then fix just what is bad, new parts are nice for more piece of mind, but just replace the broke things now, When Your a Doctor build it So Fine! I think you need a throw out bearing.
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Old 02-20-2014, 08:12 PM   #14
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Sounds good! I'll keep this thread posted on what I find out. Thanks for all of your help
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Old 02-20-2014, 10:37 PM   #15
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Had the same problem in the fall. Replaced my slave and had a oil change and the problem went away completely.
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Old 02-21-2014, 01:10 AM   #16
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Mine had the same symptoms. Ended up being the throw out bearing.
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Old 03-01-2014, 04:20 PM   #17
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Bump

Update: The past week or so the problem completely went away and it was shifting perfectly (I didn't even have to bleed/replace anything). Now suddenly today the exact same problems started happening again when I was leaving my house for work. Reverse was grinding (even with my clutch all the way down) and I couldn't get into 1st gear without *popping* it in. I noticed though if I turned off my Jeep and try shifting it goes right into gear. Would that help diagnose the problem easier?
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Old 03-01-2014, 05:12 PM   #18
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Exact same symptoms mine had. That's a clutch disengagement issue. Your clutch plate is not fully disengaging from the flywheel. Check the master cylinder first, make sure it has plenty of fluid. If it's low, refill & check for leaks.

My money is on a worn throw out bearing or pressure plate. (or both).
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Old 03-02-2014, 03:10 PM   #19
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Can you explain where exactly the master would be in a '95 4.0? And also how can I check it for fluid (I don't have much mechanical experience). Also, would a chiltons or Haynes manual help (which would be better)?
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Old 03-02-2014, 03:18 PM   #20
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The clutch master cylinder is bolted to the firewall just to the drivers side of the brake booster. Usually a white/opaque color reservoir with a black cap on it. (most of the time its easier to take off the strut that goes from the firewall to the radiator in order to get the cap off of it) Braided line on it that goes down to the bell housing to an external slave cylinder on the driver's side of the bell housing.
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Old 03-02-2014, 03:20 PM   #21
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Here is a pic of an all black one on a '92 YJ
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Old 03-02-2014, 03:29 PM   #22
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Thank you very much
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Old 03-03-2014, 07:26 PM   #23
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Thumbs up

Checked the fluid, it was pretty low. Bled the clutch, refilled the fluid, jeep shifts great! Thanks for the help

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