4x4 knocking - Dodge Cummins Diesel Forum
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post #1 of 24 (permalink) Old 01-16-2019, 01:18 PM Thread Starter
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4x4 knocking

Hello, I have a 04 5.9 4x4. I have recently started using 4x4 as it has started to snow and ice in Indiana. I noticed that after shifting into 4x4, my truck makes a knocking noise. The knocking is not very loud when accelerating, but when I let off the petal and begin to slow down the knocking gets louder. The 4x4 does work it just knocks. Should I be concerned? Is this normal?

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post #2 of 24 (permalink) Old 01-16-2019, 02:49 PM
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Put it on a lift a few inches off the ground. Have someone in the driver seat so they can put it in gear while you look and listen under the pickup.

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post #3 of 24 (permalink) Old 01-16-2019, 03:19 PM
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my guess is axle u joints

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post #4 of 24 (permalink) Old 01-16-2019, 10:26 PM
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I would second an axle you joint.

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post #5 of 24 (permalink) Old 01-17-2019, 12:21 AM
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If its a slower knock then its likely the axle u-joint. But...since you have a full-time 4wd, it should make some noise all the time.

I'm going to guess its the double cardan joint on the front driveshaft. When they get old and worn out they can knock. But DONT ignore it because when they're alerting you that means its not far from failure, and failure can mean damage.

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post #6 of 24 (permalink) Old 01-17-2019, 07:27 AM
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Mine was front drive shaft u joints. Y

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post #7 of 24 (permalink) Old 01-17-2019, 02:21 PM
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Quote:
Originally Posted by KATOOM View Post
If its a slower knock then its likely the axle u-joint. But...since you have a full-time 4wd, it should make some noise all the time.

I'm going to guess its the double cardan joint on the front driveshaft. When they get old and worn out they can knock. But DONT ignore it because when they're alerting you that means its not far from failure, and failure can mean damage.
Yeah, what he said. If it breaks you do damage to wiring and cooling lines so inspect it right away. You can buy rebuild kits for the Cardon joint if you want to save a few $$.

Axle U joints will make a lot of noise in turns, not so much going straight. Also, check your T-case fluid cause if it gets low, the chain stretches and then can jump sprocket teeth. That makes a heck of a sound.

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post #8 of 24 (permalink) Old 01-20-2019, 04:59 PM
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knock is not normal, have you checked /changed oil in t-case, ATF+4 , any metal??
should be periodically using 4wd to keep gear/hub/shift components moving freely.
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post #9 of 24 (permalink) Old 01-20-2019, 05:04 PM
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Quote:
Originally Posted by KATOOM View Post
If its a slower knock then its likely the axle u-joint. But...since you have a full-time 4wd, it should make some noise all the time.

I'm going to guess its the double cardan joint on the front driveshaft. When they get old and worn out they can knock. But DONT ignore it because when they're alerting you that means its not far from failure, and failure can mean damage.
3rd gens dont have full time 4wd , must be manually or electrically shifted, equipped with NV271 or NV273 Transfer cases, very good cases if properly maintained.
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post #10 of 24 (permalink) Old 01-20-2019, 05:54 PM
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Quote:
Originally Posted by rghavana View Post
3rd gens dont have full time 4wd , must be manually or electrically shifted, equipped with NV271 or NV273 Transfer cases, very good cases if properly maintained.
Yes they do... Model years 2002 through 2013 used full-time 4wd.
Full-time 4wd is when the only disconnect is the transfer case and the front driveshaft always spins at road speeds.
Part-time 4wd is when the disconnect is the transfer case and the CAD system (or free spin hubs) and the front driveshaft does not spin at road speeds.

And, the 4wd system should make no knocking noises...

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post #11 of 24 (permalink) Old 01-20-2019, 06:17 PM
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3rd gen cummins powered dodges are in 2wd, until you manually shift or electrically engage transfer case.

No power to front axle until transfer case is engaged.
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post #12 of 24 (permalink) Old 01-20-2019, 06:21 PM
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Quote:
Originally Posted by rghavana View Post
3rd gen cummins powered dodges are in 2wd, until you manually shift or electrically engage transfer case.

No power to front axle until transfer case is engaged.
That is how ALL 4wd systems work...
Re-read what I said previously about the differences in full-time vs part-time systems.

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