madcroc1
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M923A2 horrible loud noise coming from the differential or transfer case - 5-Ton
- Thread starter madcroc1
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Are your differentials full of oil?
Drain them and look for parts/particles.
An IR temp gun is good for finding hot spots. You can compare all the same areas on both axles.
Are any of your universal joints hot? Have they been serviced recently?
You can pull the rear drive shafts from back to front and remove the axle shafts, to disengage each differential, to isolate which one it is coming from.
Drain them and look for parts/particles.
An IR temp gun is good for finding hot spots. You can compare all the same areas on both axles.
Are any of your universal joints hot? Have they been serviced recently?
You can pull the rear drive shafts from back to front and remove the axle shafts, to disengage each differential, to isolate which one it is coming from.
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Are you able to produce the noise in any other gear than 5th? At any other speeds?
Does the sound seem like it may be from the transmission?
Rick
Does the sound seem like it may be from the transmission?
Rick
madcroc1
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Ok, Thanks for advice. I'll do it tomorrow. I just got the truck about a month ago and changed the Oil and Tranny fluid. I didn't really look at the differential oil yet. I put my hand on the axles and they didn't seem too hot. I couldn't find a dip stick for the transfer case but will check with the TM now..
It really seemed odd that since it is intermittent that it could be in the differential.
The noise doesnt sound like gears grinding but more like something is slipping...
It really seemed odd that since it is intermittent that it could be in the differential.
The noise doesnt sound like gears grinding but more like something is slipping...
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It's hard to tell where the noise is coming from when you are in the cab at highway speed. Could it be the fan kicking in and the fan clutch is bad.
ranchhopper
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Both of mine do that have for a while usually stops at a higher RPM they will usually start when bouncing over a bump then quit after a bit .
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Get a medical stethoscope and take off the end that the doctor presses to your chest when listening to your heart. Now get a long piece of steel brake line the you can attach to the hose end of the stetoscope. This will act as a long distance listening devise so you pin point the noise location. Now jack up the rears on wood blocks so the tires are off the ground. Put someone in the truck you trust and run it up to speed and listen with the stethoscope. Be very careful. I have done this before, it works like a charm.
madcroc1
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The noise seems to come and go in any gear. I'm dont think it in the transmission. it is extreeamly loud. It sounds kinda like what a failed fan clutch would sound like but louder and its under the truck not under the hood..
madcroc1
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both of your what? both of your trucks ? This noise is so loud it certainly is not normal. But again it is intermittent which is odd. I'm thinking it might be in one of the differentials. I just searched the TM and there is no Differential Maintenance procedure in the manual
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At 50 mph you may hear a noise from under the front coming from the underside.
quickfarms
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Does the noise come and go as you are driving?
madcroc1
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It come and stays for a while. Usually the rest of the day. When I park the truck for the night, usually the next day there is no noise until I drive it a bunch of miles and then it come again. It seems to last for about 5-10 miles and then slowly goes away.. Today the sound engaged and stopped a few times over about only 1 mile. It sounds like if you were fishing with a big game reel and imagine hitting a huge fish that takes the line out really fast (no clicking) just a fast mild grinding sound but really loud.
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Does it sound like the air release groan when you engage the parking brake?
madcroc1
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no...
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Maybe something is just loose and vibrating. I would get under there and start tugging on parts and see if anything is loose.
madcroc1
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It certainly isn't anything loose. I already checked it. I'll post a video of the noise in the morning
trooper632
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sounds like the fan clutch kicking on, they are loud
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There are probably a lot of noises that are present but you just can't hear them over engine noise with the nhc250 but that you can hear with the 6cta
two.fiveM35
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Great thread. My M923a1 does the same thing, I just changed the oil in the transfer case and it was black. But didn't fix the noise. I have also greased all the drive shafts, still no change. Mine is intermittent and seems to be related to bumps in the road. The noise starts instantly and stops instantly, kind of like a compressor kicking on and off,it has no pattern. Also maybe thought it was the fan clutch, but I could never get it to come on with the hood up. My truck was a 2010 Red River rebuild with only a few hundred miles since rebuild.