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Unread 03-20-2014, 09:39 AM   #1
CanaanTSA5
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Grinding Feeling

So to avoid an accident the other day I gunned it from being completely still. I haven't gunned it in a while, and I don't think my Jeep was very appreciative of it. The whole time (Which only lasted about 6 seconds), I felt what I can only describe as a grinding sensation from her. It all happened so quick I couldn't really tell where it was coming from, as I was more focused on not being hit by other vehicles, my best guess was it coming from the transmission.

It's been 3 days since then. Nothing out of the ordinary with how she is driving, so I guess my question is this: What was it, and should I be concerned at all? I've pinned the throttle plenty of times before, never really from a standstill, but never felt anything like that.

Thoughts?

98 Laredo | 4.0 | NP242 | 42RE | 178,000 | Stock other than replacement parts |

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Unread 03-20-2014, 10:00 AM   #2
johns1mj
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The only thing that comes to mind would be the t-case trying to engage with spinning tires? I am only guessing.
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Unread 03-20-2014, 10:19 AM   #3
PolkaPower
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Could be anything from a bad diff to slipping t case chain. You will have to try to duplicate it and listen.
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Unread 03-20-2014, 10:37 AM   #4
CanaanTSA5
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Quote:
Originally Posted by johns1mj View Post
The only thing that comes to mind would be the t-case trying to engage with spinning tires? I am only guessing.
I dont have a 249 though. I have a 242.
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Unread 03-20-2014, 10:40 AM   #5
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Originally Posted by PolkaPower View Post
Could be anything from a bad diff to slipping t case chain. You will have to try to duplicate it and listen.
Guess I will try to duplicate it then. Let the gas guzzling begin.
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Unread 03-20-2014, 10:43 AM   #6
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Guess I will try to duplicate it then. Let the gas guzzling begin.
I don't feel bad for you, I have a 5.9.
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Unread 03-20-2014, 12:44 PM   #7
jeepjeepster
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Think the tires were spinning slightly?

Could be something as simple as bad engine mounts. Flooring it let the engine rotate more than normal causing a vibration. I wouldn't stress until something starts grinding all the time.
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Unread 03-20-2014, 12:51 PM   #8
PolkaPower
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Think the tires were spinning slightly?

Could be something as simple as bad engine mounts. Flooring it let the engine rotate more than normal causing a vibration. I wouldn't stress until something starts grinding all the time.
Absolutely. If you are riding around with worn out parts then you will have clunks, groans, and grinds sometimes.
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Unread 03-20-2014, 01:10 PM   #9
speedbucket
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Has your jeep been to "da club" lately?
Lol








I'm gonna go with exhaust/motor mounts. As tight as it is under there, weak motor mounts and a heavy load on the drive train at wot could put the exhaust on the cross member. Or its tcase chain slap. What mode dis you have the 242 in?
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Unread 03-20-2014, 01:41 PM   #10
CanaanTSA5
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Has your jeep been to "da club" lately?
Lol

I'm gonna go with exhaust/motor mounts. As tight as it is under there, weak motor mounts and a heavy load on the drive train at wot could put the exhaust on the cross member. Or its tcase chain slap. What mode dis you have the 242 in?
I was in 2WD. And she had been driving for about 2 hours, so everything should be all warmed up at that point. My motor mounts are in surprising good shape, dont know about the tranny mounts though.
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Unread 03-20-2014, 03:15 PM   #11
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I was in 2WD. And she had been driving for about 2 hours, so everything should be all warmed up at that point. My motor mounts are in surprising good shape, dont know about the tranny mounts though.
How do you know they are in good shape? Did you take a pry bar to them and see if you could move the motor?
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Unread 03-20-2014, 08:30 PM   #12
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How do you know they are in good shape? Did you take a pry bar to them and see if you could move the motor?
Nada. My teacher always said that as long as they are not cracked or visually look bad, they are usually good. I guess that was just his opinion.

So...could that noise have come from the water pump? My belt started to squeak on the way home from work tonight, and when I opened the hood when I got home, much burning antifreeze did I smell, and some wonderful smoke to go with it. Looks to be coming from the water pump, or at least that's my amateur opinion.
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Unread 03-21-2014, 04:25 AM   #13
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Well if the water pump is leaking it's time for a new one asap regardless of whether that is the cause of the noise or not.
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Unread 03-21-2014, 04:30 AM   #14
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Well if the water pump is leaking it's time for a new one asap regardless of whether that is the cause of the noise or not.
Well I agree with that, it's getting done today.
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