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Old 06-18-2014, 10:15 PM
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Adjusting a manual transmission

My manual in my TJ 1999 Wrangler is not shifting consistently as well as it should. It has 124,000 on it. Sometimes from a standstill, I find that getting into first gear is not easy...getting into second typically is easier. Also, at times, trying to get into reverse causes grinding...till I shift into first and then back into reverse.

Does this require adjusting of the shift cables or clutch linkage? And is this a big job?

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Old 06-18-2014, 10:21 PM   #2
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There are no shift or clutch linkages. The clutch is hydraulic, and the gear shift lever goes right into the top of the transmission. First, check the fluid level in your clutch master cylinder under the hood right next to the brake master cylinder.

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Old 06-18-2014, 10:21 PM   #3
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My son's 97 is tempremental from time to time. Does the Jeep fast idle often. Ours did and when we finally got that corrected, it helped considerably. Also recommend Redline MTL fluid.
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Old 06-18-2014, 10:52 PM
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Thanks for the input! First, I did recently put Redline MTL in it. It did help some.
Also, I never saw that clutch master cylinder next to the brake master cylinder. I did check it just now and the "float" is right up there. So that isn't it.

So what do you think now?
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Old 06-18-2014, 11:02 PM   #5
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Might be worth a try to bleed the system.
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Old 06-18-2014, 11:04 PM   #6
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The 5 spd does not have a synchronized reverse gear, shifting into a forward gear before shifting into reverse is common practice.
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Old 06-18-2014, 11:07 PM
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Freeskier, I know that the reverse gear isn't synchronized. And when I had trouble with it months ago for the first time, you are right, as others suggested, I would shift into a forward gear and then it would work better. But now, it doesn't help as much. Something is different.
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Old 06-18-2014, 11:09 PM
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Double ought, why would bleeding the system help? Do you mean replacing all the clutch master cylinder fluid? Andybody else have ideas let me know. Thanks in advance.
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Old 06-18-2014, 11:09 PM   #9
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Considering some of your other issues it sounds like the clutch might be dragging a bit.
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Old 06-18-2014, 11:14 PM   #10
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Double ought, why would bleeding the system help? Do you mean replacing all the clutch master cylinder fluid? Andybody else have ideas let me know. Thanks in advance.
Just in case there might be a little air in the system. A total flush might not hurt though. I did this on my brakes per recommendation by others on this forum and made a total difference in the way my Jeep stops. I'm just thinking out loud. I know the AX15 is tempremental and as others have suggested, shifting to a forward gear first helps sometimes but others, does not seem to make a difference. I hate to say it but sometimes, I think it's just part of the JEEP thing.
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Old 06-18-2014, 11:16 PM
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Also, my engine light came on last week and I had that checked earlier today and they say it is the o2 sensor that needs replacement, but that is all...and that seems to have nothing to do with the manual transmission. I don't know what else to say. Maybe the synchronizers are wearing out?
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Old 06-18-2014, 11:18 PM   #12
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Also, if your only having trouble getting into first and reverse, probably not the tranny. If bleeding/flushing doesn't help, might need a new hydraulic assembly. I've never changed one but is my understanding from others on the forum that the the master, slave and hose come as a complete assembly, often times even pre-bled.
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Old 06-18-2014, 11:21 PM
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Considering some of your other issues it sounds like the clutch might be dragging a bit.
Do you mean that it is worn? That it will have to be replaced? It can't be out of adjustment because there is no adjusting of a hydraulic clutch right?
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Old 06-18-2014, 11:24 PM   #14
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1st and reverse are not synchronized. If I want to go into reverse but I'm in 3rd I have to go to first then reverse is easy. So go to first then reverse. I never have a prob getting into 1st. Do a search here if you do.
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Old 06-18-2014, 11:29 PM   #15
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1st gear is fully synchronized in all TJ manual transmissions.
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Old 06-18-2014, 11:31 PM   #16
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1st gear is fully synchronized in all TJ manual transmissions.
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Old 06-18-2014, 11:45 PM   #17
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Do you mean that it is worn? That it will have to be replaced? It can't be out of adjustment because there is no adjusting of a hydraulic clutch right?
Not necessarily, as stated above it could be air in the line preventing full actuation.
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Old 06-18-2014, 11:58 PM   #18
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1st gear is fully synchronized in all TJ manual transmissions.
The nsg370 isn't if I recall, that's part of the reason why people are dropping their 2nd gear synchro in the higher geared jks. Not enough oomph to get it started in second without a hot clutch.
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Old 06-19-2014, 08:36 AM   #19
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First gear is sunchronized in my NSG 370.

People have trouble with their second gear synchro because they shift too fast from 1 to 2. The NSG 370 does not like to be shifted fast 1-2. It needs to be pretty slow and deliberate, almost a pause in the neutral gate before moving into 2.
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Old 06-19-2014, 09:43 AM   #20
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Thanks for that info Lynn.
I have an 06 with the 2.4, and it has the 370 trans. I have noticed that moving slower between 1st, and 2nd, has been nessesary frequently, and seems to make the entire sequence up and down the gear range easier.
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Old 06-19-2014, 10:00 AM   #21
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I came to the NSG 370 from 16 years with a wide-ratio T18 trans... a truck trans with a long throw.. so a slow 1-2 shift is normal to me. Many folks coming to the NSG 370 from other transmissions that are more forgiving to fast shifts have a harder time adapting to the necessary slow shift.

Sorry this is a a bit OT to the OP's 5-speed, but slower shifts in the 5-speed may help if the synchros aren't already toasted.
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Old 06-19-2014, 10:28 AM   #22
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Quote:
Originally Posted by Hazlitt777 View Post
Do you mean that it is worn? That it will have to be replaced? It can't be out of adjustment because there is no adjusting of a hydraulic clutch right?
It is most likely a hydraulic issue, although without doing some diagnostics, you would not know for sure. A complete master cylinder/slave cylinder/inter connecting line can be purchased as a unit pre-filled and pre-bled ready to bolt in for <$200 at Napa.

I seriously doubt that this is a transmission problem, but it could also be a mechanical clutch problem...either the release bearing, pressure plate or a bad bushing where the master cylinder pins to the clutch pedal.
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Old 06-19-2014, 11:51 AM   #23
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X2 lynn, Jeep manual transmissions, are not Detroit or Saginaw, "Rock Crusher," manual transmissions, and require a little more finesse while shifting. A slight pause in neutral between one gear to another gear, makes engaging easier and fuller.
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Old 06-19-2014, 11:47 PM
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Thanks everyone for the feedback.

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