Author Topic: Strange noises (Read 3249 times)

TacoCrawler · « **on:** Aug 20, 2009, 12:52:23 AM »

Alright so there have been some strange almost grinding like noises coming from my drive train somewhere. It is only there while in low RPMs on acceleration and while using the engine to slow down. After I get to above about 2800 RPMs it goes away. I cant tell what it is. It drives smooth and isn't lacking on any power. What could this be?

Slolyfe · « **Reply #1 on:** Aug 20, 2009, 10:57:15 AM »

Does it actually go away? Or just get masked by the motor?

ROCKO · « **Reply #2 on:** Aug 20, 2009, 11:53:24 AM »

is it lifted? are you still running the stock driveline? (if its lifted)

TacoCrawler · « **Reply #3 on:** Aug 20, 2009, 03:00:35 PM »

Quote from: slolyfe on Aug 20, 2009, 10:57:15 AM

Does it actually go away? Or just get masked by the motor?

I bvelieve it goes away it could be masked though by the sound but then its not there when at a slow coast or when sitting at a idle. Could it be the valves or something like that?

Quote from: ROCKO on Aug 20, 2009, 11:53:24 AM

is it lifted? are you still running the stock driveline? (if its lifted)

It is lifted and I am not sure if its tthe stock drivelines or not cause i bought it with the lift. I just added 1" longer shackels but if it was the driveline wouldnt it shake the truck when at higher speeds?

bigarms23 · « **Reply #4 on:** Aug 20, 2009, 07:05:30 PM »

could have a chip in the spine on your drive shaft

Plekto · « **Reply #5 on:** Aug 21, 2009, 10:45:01 AM »

yeah grinding like that is something in the drive-line. Could be a chip, could be excess play and slipping. Fix now before it costs a lot of money.

ROCKO · « **Reply #6 on:** Aug 21, 2009, 10:59:49 AM »

Quote from: my86redtoy on Aug 20, 2009, 03:00:35 PM

I bvelieve it goes away it could be masked though by the sound but then its not there when at a slow coast or when sitting at a idle. Could it be the valves or something like that?
It is lifted and I am not sure if its tthe stock drivelines or not cause i bought it with the lift. I just added 1" longer shackels but if it was the driveline wouldnt it shake the truck when at higher speeds?

start with a new drive line...that most likly your problem

95toyrunner · « **Reply #7 on:** Aug 21, 2009, 12:17:29 PM »

i just lifted the rear of my 4runner with the stock drive shaft and i have the EXACT same thing happening!!

TacoCrawler · « **Reply #8 on:** Aug 21, 2009, 01:04:50 PM »

alright if it is the driveline would I be able to see any physical damage being done? And I am guessing it would have to be the rear drveshaft since I am running IFS as of now

95toyrunner · « **Reply #9 on:** Aug 21, 2009, 01:11:15 PM »

it sounds to me like its the rear driveshaft on mine. check the splines for damage.

TacoCrawler · « **Reply #10 on:** Aug 21, 2009, 01:16:54 PM »

Alright it soinds like I will have to pull it apart then. If its that it might explain a few other issues that have been going on. Hopefully thats it cause I just put a 4.7 t-case in it and I hope the noise isnt comming from there

Slolyfe · « **Reply #11 on:** Aug 21, 2009, 01:32:05 PM »

You can always take out your rear driveline and drive it in 4wd. If there is no noise its prob the rear driveline

TacoCrawler · « **Reply #12 on:** Aug 21, 2009, 01:48:35 PM »

yea good idea that should help cancel out some possibilities of what it could be I will do that today and tell what I find out

ROCKO · « **Reply #13 on:** Aug 21, 2009, 02:21:27 PM »

grease the crap out of your drive-line and see if it goes away.....thats what i did for about a year or so till i got new drive lines

TacoCrawler · « **Reply #14 on:** Aug 21, 2009, 03:12:01 PM »

Yea just took it apart and the splines are fine and there is plenty of grease in there but I will put more. It lookes like it is too steep of an angle for the u-joint at the axle end and it is folding on its self for the the two peices to make contact cause there are marks from rubbing on itself. I think I am just gonna have to get some angled shims or something like that. to fix it cause I dont really have the money for a new driveline as of right now

95toyrunner · « **Reply #15 on:** Aug 21, 2009, 10:18:16 PM »

you should still try slolyfe's method to be sure

TacoCrawler · « **Reply #16 on:** Aug 21, 2009, 10:55:28 PM »

Quote from: 95toyrunner on Aug 21, 2009, 10:18:16 PM

you should still try slolyfe's method to be sure

Yea I tried that and the noise I was hearing was gone so I am sure it was the rear driveshaft. But then when driving around in 4 hi there was grinding noise comming from the front diff when i got up to road driving speed. What could that be? Everything works fine just a horrible noise but not there when crawling or under 15?

Slolyfe · « **Reply #17 on:** Aug 23, 2009, 07:40:15 PM »

Quote from: my86redtoy on Aug 21, 2009, 10:55:28 PM

Yea I tried that and the noise I was hearing was gone so I am sure it was the rear driveshaft. But then when driving around in 4 hi there was grinding noise comming from the front diff when i got up to road driving speed. What could that be? Everything works fine just a horrible noise but not there when crawling or under 15?

Grinding or more like a humming noise? Mine is pretty loud in 4wd High. It was just the extra gears in the tcase because more is stuff is moving around in there when 4wd is engaged

Steve_925 · « **Reply #18 on:** Aug 23, 2009, 09:11:11 PM »

are you sure it not the u-joint. i had a u joint go out and it sounded like scraping two knifes together.

TacoCrawler · « **Reply #19 on:** Aug 23, 2009, 11:23:08 PM »

No I know the humming sound and that wasnt it. I think might be the u joints or what ever there is in the axles for the IFS. It pops and what not when in 4 wheel drive. Is that bad or will it break soon? I am taking it through fridyce this upcomming weekend and I would likt to try to fix any worn out parts in the alredy weak IFS upfront.

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