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Old 01-16-2014, 05:19 PM   #1
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Gears grinding

97 TJ 4.0...when shifting from 1-2 it doesn't make a sound...but 3-4-5 and makes a very small grinding sound. Is this something major?

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Old 01-17-2014, 10:04 AM   #2
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Also having an issue when I try to take off in first gear, sometimes it wants to jump out of gear.

Am I looking at a throw out bearing issue. Clutch bled, or sync in the transmission?

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Old 01-17-2014, 06:03 PM   #3
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Sounds like your Synchro's are going. Check your fluid, it could be time for a change or it could be low...
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Old 01-17-2014, 07:24 PM   #4
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Sounds like your Synchro's are going. Check your fluid, it could be time for a change or it could be low...
I was told the synchro's might be the issue. Plan to check the fluids and such tomorrow. Any chance the clutch might be going?
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Old 01-17-2014, 09:16 PM   #5
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Does the clutch engage in the middle or all the way at the top?
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Old 01-17-2014, 10:02 PM   #6
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Almost to the top.
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Old 01-17-2014, 10:37 PM   #7
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Sounds like its on its way out. How many miles on it? Could have a hand in the grinding... Probably your Synchro's going out.
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Old 01-17-2014, 10:44 PM   #8
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Sounds like its on its way out. How many miles on it? Could have a hand in the grinding... Probably your Synchro's going out.
125,000 miles. Hopefully it is one or the other...and not both.
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Old 01-22-2014, 09:24 AM   #9
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BUMP


I'm having a similar in my '99 TJ where from 1st going into 2nd results in a small grind and then 3rd, 4th and 5th & Reverse are perfectly fine. The clutch doesn't engage until almost 1/2 way from the floor. This does go away after it warms up and has been running for about 10-15 miles of city driving forcing me to shift into second. Any thoughts? Is a manual transmission the same as an automatic transmission where if its cold the transmission shifts harder if it's not warmed up? Stupid question, but if it goes away after some miles of driving my thought is that the vehicle transmission is finally warmed up. Just a thought!

I just want to fix anything that is going out or being stupid.

(Note: I'm not mechanically inclined at all, but I'm quickly learning and am very hands on. Just replaced the blower motor, blower motor switch, replaced the spark plugs, distributor, distributor cap & oil pan)
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Old 01-22-2014, 09:57 AM   #10
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I have talked to several mechanics that deal with jeeps, and also a few transmission shops and they are telling me the synchro is going out. Not really sure how reliable they are.

I was hoping I would just be able to drain the fluids and replace and see if that helps but apparently time is not in my favor at the moment!
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Old 01-22-2014, 10:11 AM   #11
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I have talked to several mechanics that deal with jeeps, and also a few transmission shops and they are telling me the synchro is going out. Not really sure how reliable they are.

I was hoping I would just be able to drain the fluids and replace and see if that helps but apparently time is not in my favor at the moment!
From what I've found, they're not that expensive to replace. I don't plan on replacing anything on mine until it really starts being stupid because on mine it goes away after a couple of city mile driving. Although, yours does sound like a different animal all-together. lol

Good luck!
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Old 01-22-2014, 10:29 AM   #12
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Let's hope this animal is kind and gentle on the wallet. LOL
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Old 01-22-2014, 11:19 AM   #13
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Quote:
Originally Posted by BusinessRogue View Post
BUMP I'm having a similar in my '99 TJ where from 1st going into 2nd results in a small grind and then 3rd, 4th and 5th & Reverse are perfectly fine. The clutch doesn't engage until almost 1/2 way from the floor. This does go away after it warms up and has been running for about 10-15 miles of city driving forcing me to shift into second. Any thoughts? Is a manual transmission the same as an automatic transmission where if its cold the transmission shifts harder if it's not warmed up? Stupid question, but if it goes away after some miles of driving my thought is that the vehicle transmission is finally warmed up. Just a thought! I just want to fix anything that is going out or being stupid. (Note: I'm not mechanically inclined at all, but I'm quickly learning and am very hands on. Just replaced the blower motor, blower motor switch, replaced the spark plugs, distributor, distributor cap & oil pan)
Do you run a t case drop? Try shifting slower and let it go in and not force it
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Old 01-22-2014, 11:56 AM   #14
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I have talked to several mechanics that deal with jeeps, and also a few transmission shops and they are telling me the synchro is going out. Not really sure how reliable they are. I was hoping I would just be able to drain the fluids and replace and see if that helps but apparently time is not in my favor at the moment!
I have heard of non Mopar transmission fluid causing rough shifting. Your clutch working different when warm or different gears is odd. It should work the same all the time. You may have more than one issue.

Definitely check fluid in clutch and make sure all your linkage is intact and functioning properly. Would suck to drop the tranny then find out its pedal linkage in side the jeep.
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Old 01-22-2014, 12:12 PM   #15
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Originally Posted by BusinessRogue View Post

From what I've found, they're not that expensive to replace. I don't plan on replacing anything on mine until it really starts being stupid because on mine it goes away after a couple of city mile driving. Although, yours does sound like a different animal all-together. lol

Good luck!
The stiff shifting when cold is a common characteristic of the AX15 trans. My '98 would shift so stiff on a cold morning that I'd have to let the RPMs come down to get it into 2nd. Last winter I drained the trans and filled with Redline MT90. I was amazed at the difference. It shifts smooth as butter at all temps. Redline ain't cheap at $15 a quart (takes 3.25q) but was worth every penny to me.
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Old 01-22-2014, 01:30 PM   #16
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What would be the chances of me changing my transmission fluid to Redline MT90 and it possibly resolving my shifting issue?
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Old 01-22-2014, 02:16 PM   #17
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Might as well try, cheaper than having it rebuilt.
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Old 01-23-2014, 10:57 AM   #18
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Do you run a t case drop? Try shifting slower and let it go in and not force it
Honestly, (you're going to laugh) I haven no idea WTF you just asked me. I've tried shifting normal, extremely slow, slow and fast; which all have resulted in a grind into second until the vehicle has warmed up between the 110-210F and then it shifts like a dream. I guess I'm just used to automatic transmissions having the similar issue where the first gear may run long (like in my 2011/2013 silverado 1500/2500HD) and shift kind of hard if they're not really warmed up.

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Originally Posted by All Terrain TJ View Post
The stiff shifting when cold is a common characteristic of the AX15 trans. My '98 would shift so stiff on a cold morning that I'd have to let the RPMs come down to get it into 2nd. Last winter I drained the trans and filled with Redline MT90. I was amazed at the difference. It shifts smooth as butter at all temps. Redline ain't cheap at $15 a quart (takes 3.25q) but was worth every penny to me.
Great! **Wipes brow** I was hoping that was a part of it. I'm going to be doing a lot of work on the Jeep this coming weekend. I have to adjust the camber of my tires, adjust the axle, flush the diffs and will probably also drain the transmission and fill with the product you mentioned. I'm a noob, but can read a book and can use tools so I'm sure I'll be able to get it done. lol

Thank you everyone for your help! I hope your responses have also helped the OP!
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Old 01-23-2014, 11:06 AM   #19
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What would be the chances of me changing my transmission fluid to Redline MT90 and it possibly resolving my shifting issue?
According to many here is makes shifting worse and they wish they didn't use it.
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Old 01-23-2014, 11:15 AM   #20
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According to many here is makes shifting worse and they wish they didn't use it.
I've always heard the old tale that when you change your transmission fluid the tranny ends up going out after you change it.
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Old 01-23-2014, 05:44 PM   #21
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According to many here is makes shifting worse and they wish they didn't use it.
You are the first person to say anything bad against it from what I have seen so far. Kinda stuck in a rock and a hard place with it at the moment.
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Old 01-23-2014, 06:34 PM   #22
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You are the first person to say anything bad against it from what I have seen so far. Kinda stuck in a rock and a hard place with it at the moment.
Here is where I read it days ago. Tranny plug metal shavings ? I'm taking their advice. Like I said I was going to buy some. Lots of advice here on the forum lol. In both directions. Hope what ever you choose works out for you.
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Old 01-23-2014, 10:05 PM   #23
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In that thread they are complaining about Royal Purple not Redline.
I can't speak for anyone else but I will share my experience.
I switched to redline MT90 in my AX15 and shifting (especially cold weather) improved.
We switched Redline MTL in my sons 2000 NV3550 and shifting improved. It also got noticeably quieter.
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Old 01-23-2014, 10:18 PM   #24
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In that thread they are complaining about Royal Purple not Redline. I can't speak for anyone else but I will share my experience. I switched to redline MT90 in my AX15 and shifting (especially cold weather) improved. We switched Redline MTL in my sons 2000 NV3550 and shifting improved. It also got noticeably quieter.
You are correct. I will note that the only fluid that my book says to only use Mopar is the transmission. Everything else says or equivalent. I did a quick search about fluids instead of just reading on the forum and found lots of negative stuff about both. I found nothing bad about the Mopar recommended fluid. Bad stuff about both redline and royal purple. I'm glad it is working great for you. Wish I felt safer with it after my research. But right now I feel like the stealership has me by the balls. The Mopar fluid is highway robbery.
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Old 01-23-2014, 10:38 PM   #25
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The manufacturer also said to run GL5 rated gear lube. After many trashed brass synchronizers they quietly decided that wasn't such a good idea.
I agree, you should use what makes you feel comfortable.
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Old 01-25-2014, 08:15 AM   #26
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Bump. Still looking for opinions!

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