Knocking sound in 4 high only 45-60 MPH - Page 2 - Dodge Cummins Diesel Forum
3rd Gen. Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #13 of 19 (permalink) Old 01-29-2020, 12:36 AM
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Originally Posted by White2005 View Post
How high of speed is 4HI rated for? (Aside from “Boosted” launches?)

When above 50 MPH, I thought 2WD was the recommended mode...?
I’ve been over a 100mph in many 3rd gens...


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post #14 of 19 (permalink) Old 01-30-2020, 07:33 PM Thread Starter
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owners manual just says not to engage above 50 or 55. I took that to mean not to shift into 4 Hi above that speed not that it couldn't be driven above that speed in 4 high. I have always driven my 4 wheel drives trucks up to highway speeds on winter roads in Michigan including this one and it's never been a problem.

2004 2500 heavy duty quad cab 4x4
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post #15 of 19 (permalink) Old 01-30-2020, 08:12 PM
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I've run mine at interstate speeds for 100s of miles in 4Hi over the years.
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'03 QCLB 2500 305/555 NV5600 w/ FastCoolers 3.73 4x4, Color match Lear Topper.
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post #16 of 19 (permalink) Old 02-03-2020, 08:28 PM Thread Starter
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Well my buddies tires and rims made no difference so it's not related to a tire issue. There does seem to be more play in my front and rear outputs of my transfer case than his truck but it is a minor difference. The truck is going back out to the shop this Wednesday and we are having the transfer case rebuilt. Hopefully we will soon know the cause of this noise.
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2004 2500 heavy duty quad cab 4x4
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post #17 of 19 (permalink) Old 02-13-2020, 07:48 PM Thread Starter
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There doesn’t seem to be a way to attach photos on here from my phone. They finally got the t case separated from the trans. What an absolute mess. The corrosion between the two pieces was unreal. On top of that the ring on the front of the t case is broken with a crack just over half way around the entire piece. Had to replace the entire front half of the t case. The chain had enough slack in it that appears to have been walking up the gear teeth and then slapping back down. This truck has not been abused at all and is rarely driven in the winter to keep it out of the salt. Hopefully it’s all back together next week and I can have it back with no more knocking in 4 high.
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2004 2500 heavy duty quad cab 4x4
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post #18 of 19 (permalink) Old 02-14-2020, 06:21 AM
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How many miles??
Not common issue.
OEM, POS castings not protected (also on trans should check it) need to maintain exterior ie powerwash, then fluid film or equivlent.

At some point new will be cheaper, can get brand new for 1400-1700 depending options/shaft sizes
https://torqueking.com/category/2003...ram-2500-5500/


Since your shop botched diagnoses, should give you a break on labor
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04 QCSB HO Automatic
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post #19 of 19 (permalink) Old 02-14-2020, 02:40 PM Thread Starter
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99500 miles bought it from my Grandfather in 2009 when it was 5 years old and at the time had 44000 miles on it. i put around 5000 a year on Ol' Bessie. Only used for pulling my 5th wheel or when i just need it like fishing trips or hunting season. It has not spent much time as a daily driver. I am really hoping the knocking sound is gone after all of this.

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