grinding noise - JeepForum.com

 
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post #1 of 12 Old 12-31-2004, 11:26 PM Thread Starter
83 cj-7 258
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grinding noise

When im going between 5-20 mph i hear a gringing noise coming from the drivetrain. My 1st thought that the tc was in the 4wd, but it was not. Then I checked the hubs , they were also in the 2wd position . I know the throw out bearind is shot, so could the noise be coming from the piolt bearing.
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83 cj-7 built Chevy 350, sm420, dana 300. Superlift 4in lift, 33x12.50 mikey thompson mtz.
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post #2 of 12 Old 01-01-2005, 07:33 AM
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Neither your pilot bushing or your throw out bearing should be engage while driving at 5-20 mph. It could be any number of things including your transmission &/or t'case. Does it do it when you are in different gears/going faster? Does it do it on acceleration/decelleration? Louder on acceleration/deceleration? Is the noise louder/quieter with the clutch in?

Anything is possible if you don't know what you are talking about.
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post #3 of 12 Old 01-01-2005, 10:46 AM
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Does it do it in all gears, or only in first? Does it change if you ride the cluch pedal? Does it change under acceleration? Deacceleration? Might also check front wheel bearings and disc brake pads and backing plates.
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post #4 of 12 Old 01-01-2005, 11:50 AM
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grinding noise

Sounds like it is time for some new U joints.
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post #5 of 12 Old 01-01-2005, 11:37 PM Thread Starter
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It only does it in 1st gear and it does not get louder. Its the same under acceleration and deacceleration. Once i put the clutch in the noise stops. It doesn't always grinds. It sounds like it is coming from the clutch area or the front driveshaft. I dont think its the brakes because it sounds like its coming from the center of the jeep.
THANKS!

83 cj-7 built Chevy 350, sm420, dana 300. Superlift 4in lift, 33x12.50 mikey thompson mtz.
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post #6 of 12 Old 01-02-2005, 06:18 AM
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Unscrew the transmission cover and look inside for chipped teeth or a bad 1st gear synchro. Drive it around slowly with the cover off to see if you can identify the noise better.

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post #7 of 12 Old 01-02-2005, 07:08 AM
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Like he said

Anything is possible if you don't know what you are talking about.
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post #8 of 12 Old 01-02-2005, 10:28 AM
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The fact that it only does it in first indicates a trans problem. You need to pull the shift cover and take a look. You need to inspect the shift forks for wear, bending. Make sure the forks haven't sheared the roll pins connecting them to the rails. Be sure there isn't damage to the reverse shift mechenism causing the reverse idler gear to come in contact with the first gear. Put the lide on,shift into first, then carefully remove the lid and inspect the gear mesh. Again, be sure to look at the reverse idler. Problems other than shifting are bad countershaft bearings/thrust washers,bad output bearing, worn first gear thrust washer.
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post #9 of 12 Old 01-02-2005, 11:50 AM Thread Starter
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sometimes when i put it in to reverse it grinds, you can hear and feel it. this is only at a stop when going into reverse. now I remenber a few days ago i was at a stop light, light turned green jeep stalled out of no where. Fired it back up hopped on the gas ans heard a very bag grinding noise. stopped at a gas station ever thing locked fine , so i headed home with coution. Would this have to do with grinding noise, even though the noise was there before the inncident.
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83 cj-7 built Chevy 350, sm420, dana 300. Superlift 4in lift, 33x12.50 mikey thompson mtz.
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post #10 of 12 Old 01-02-2005, 04:21 PM Thread Starter
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i finally found the problem. Its when i have my foot resting on the clutch, and the reason i dont hear it in any other gears is because the jeep gets to loud to hear it. I know my throw out bearing is shot because when im netural it rattles like crazy. Can I replace the throw out bearing without removing the trans.
THANKS!

83 cj-7 built Chevy 350, sm420, dana 300. Superlift 4in lift, 33x12.50 mikey thompson mtz.
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post #11 of 12 Old 01-02-2005, 06:19 PM
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You sure can... remove the engine... DOH!


Quote:
Originally Posted by 83 cj-7 258
i finally found the problem. Its when i have my foot resting on the clutch, and the reason i dont hear it in any other gears is because the jeep gets to loud to hear it. I know my throw out bearing is shot because when im netural it rattles like crazy. Can I replace the throw out bearing without removing the trans.
THANKS!

-----------------------
I used to own two CJ's...Perhaps a 3rd is in the future?
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post #12 of 12 Old 01-03-2005, 07:22 AM
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You have to separate the engine from the transmission. Personally, I would pull the transmission and tranfercase out and leave the engine in. Some people go the other way. While I had it apart I would pull the transmission cover and give everything a good look see. It would also be a good time to repair any leaks.

Anything is possible if you don't know what you are talking about.
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