Noise at very low speed

[Gcelevator]

So i have been driving my M1123 around the block (no tag yet) and i have noticed that at very low speed, specially when the truck is not under load (load from the engine) i hear a noise under the tunnel similar to when a U joint is damaged or flike something not centric hitting some place (nothing hitting that i can see) is this normal on these trucks? Any known part that creates this noise? Any hidden place to look at and not visible without disassembly?

 

[glcaines]

You could have it put on a lift and with the wheels turning try to see where the noise is coming from.

 

[Action]

See if you can move the middle part of the front propshaft (driveshaft) up and down. To see if the carrier bearing is bad. It is on the LH motor mount bracket.

 

[Gcelevator]

See if you can move the middle part of the front propshaft (driveshaft) up and down. To see if the carrier bearing is bad. It is on the LH motor mount bracket.

Gootd point, i will check it out. I was more concerened in the rear as the noise seems to come from the rear section however, noices under the tunnel travel and can be deceiving.

 

[Gcelevator]

You could have it put on a lift and with the wheels turning try to see where the noise is coming from.

Hard to source a lift. Need to have it registered first to drive further, government has not released my SF97

 

[TOBASH]

Maybe a rattle from the heat shield?

 

[Gcelevator]

Maybe a rattle from the heat shield?

No, not rattle. More like hitting sound or like a bolt hitting something every time it passes throught he same place. Like the prop shaft hitting the diesel tank but it is only at very low speeds.

 

[williamh]

Speed up

 

[Gcelevator]

Speed up

I can't

 

[williamh]

I still haven’t got my SF97 either. , I do all my driving at O-dark 30. But I live in a fairly rural area. I thought I had huge suspension issues , at above 40 it felt like the wheels were going to fall off. Everything shook like I owed it money. A new set of csm tires and dumping those run flats. Like driving a different truck. Got noise ? Grab a flashlight and crawl under that truck. Pull or shake everything. If it’s rubbing you should see some shiny metal. Jack up each wheel and see if it has unusual play.

 

[Gcelevator]

I still haven’t got my SF97 either. , I do all my driving at O-dark 30. But I live in a fairly rural area. I thought I had huge suspension issues , at above 40 it felt like the wheels were going to fall off. Everything shook like I owed it money. A new set of csm tires and dumping those run flats. Like driving a different truck. Got noise ? Grab a flashlight and crawl under that truck. Pull or shake everything. If it’s rubbing you should see some shiny metal. Jack up each wheel and see if it has unusual play.

Broward county here, very liberal woke county in FL and while i support the man in blue i don't want to do stupid things for the stupid prices. 1 block from my house there's a church where they spent lots of time so a no,no for me.
I will check tomorrow for what @Action mentioned, support for the front shaft bar. That might be the culprit. I will report tomorrow or whenever.

 

[Coug]

I had the bolts holding the brake caliper bracket to the differential back out on me, and made contact with the halfshaft bolts inside the rotor. Kind of a grindy, ticky thumpy noise.




You can kind of see the damage to the end of the halfshaft bolt, as well as a little bit of a gap between the large bolt head and the bracket it secures



and afterwards

Front differential/brake issues fixed

So as some of you know, I had the bolt holding the brake caliper bracket back out of the differential and come into contact with the ends of the halfshaft bolts sticking through the rotor. Since I was down there anyway, I decided to take care of the oil leak I saw on that side of the...

www.steelsoldiers.com

 

[Gcelevator]

I had the bolts holding the brake caliper bracket to the differential back out on me, and made contact with the halfshaft bolts inside the rotor. Kind of a grindy, ticky thumpy noise.




You can kind of see the damage to the end of the halfshaft bolt, as well as a little bit of a gap between the large bolt head and the bracket it secures
View attachment 868032


and afterwards

Front differential/brake issues fixed

So as some of you know, I had the bolt holding the brake caliper bracket back out of the differential and come into contact with the ends of the halfshaft bolts sticking through the rotor. Since I was down there anyway, I decided to take care of the oil leak I saw on that side of the...

www.steelsoldiers.com

I guess i have to re check everything again. I have put like 20 miles around the block already.

 

[Coug]

checking for noises while moving is definitely a 2 man job. Things like carrier bearing are easy stationary checks, but some things just don't show up when stationary.

 

[Action]

Halfshaft bolts backing out?
Ziptie on propshaft hitting something as it spins?

 

[MarkM]

Check the tranny mount. Getting on and off the throttle can cause a thump if the tranny mount is gone. No, these trucks shouldn't have that kind of sound but the good folks at AM General have gifted us with a plethora of rhythmic and tantalizing sounds to enjoy.

Mark

Mark

 

[Mullaney]

OR it could be more than a normal loose bolt...



.

 

[Gcelevator]

Check the tranny mount. Getting on and off the throttle can cause a thump if the tranny mount is gone. No, these trucks shouldn't have that kind of sound but the good folks at AM General have gifted us with a plethora of rhythmic and tantalizing sounds to enjoy.

Mark

Mark

Tranny mount is split in half. Up for replacement. Thanks.

 

[Gcelevator]

See if you can move the middle part of the front propshaft (driveshaft) up and down. To see if the carrier bearing is bad. It is on the LH motor mount bracket.

Action, check the video please. Is this movement showing a bad carrier bearing?

 

[Coug]

Usually a bad carrier bearing will have the rubber shredded or the bearing itself falling apart, or an obvious separation between the rubber and the bearing.
To me that still looks okay.