NV4500 5th gear whine? - Dodge Cummins Diesel Forum
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post #1 of 12 (permalink) Old 03-11-2009, 03:50 PM Thread Starter
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NV4500 5th gear whine?

I have noticed that when I am running in 5th gear the tranny whines/sings a little, not bad but a little. I can drop to 4th and it goes away. usually can only hear it at slower speeds like 40-60 mph. May be there at higher speeds and just gets drowned out, I am not sure.

I keep hearing about a 5th gear nut coming loose on the NV4500 transmissions, where is this nut located and how much trouble is it to check?


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post #2 of 12 (permalink) Old 03-11-2009, 04:07 PM
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You don't want to drive in 5th gear at less than about 62mph or with the rpms above 2000, it will lug the motor & cause all kinds of problems including loosening the gear nut. The whine you hear could be a loose gear shaft, worn gear teeth, etc. The noise is likely a sign of trouble, so have it checked out.

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post #3 of 12 (permalink) Old 03-11-2009, 04:14 PM
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You don't want to drive in 5th gear at less than about 62mph or with the rpms above 2000, it will lug the motor & cause all kinds of problems including loosening the gear nut. The whine you hear could be a loose gear shaft, worn gear teeth, etc. The noise is likely a sign of trouble, so have it checked out.
Not sure what other problems lugging creates. Also the MPH does not really mean much. 62mph in 4th gear is rapping that engine a little tight. Basically try to stay out of 5th below 1800 rmp. Keep in mind this is absolutely no guarantee that it will not fall off... I'd say you do have something going on with it. Normally the gear just falls off when going into or out of a coast condition. No noise or anything... just falls off...

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Last edited by Shainer; 03-11-2009 at 04:18 PM.
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post #4 of 12 (permalink) Old 03-11-2009, 05:26 PM
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Lugging the engine is not good for the tranny in general, especially 5th gear. Lugging is also bad for the engine, its a lot better on the engine to be at higher rpms. Other than redlining it, there's no so such thing as winding it "too tight", the 24v Cummins loves high rpms, not great for mpg though. When I lost 5th gear 1000 miles from home, I came home in 4th at 65mph at about 2600rpm.

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post #5 of 12 (permalink) Old 03-11-2009, 05:29 PM
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check your fluid level
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post #6 of 12 (permalink) Old 03-11-2009, 05:34 PM Thread Starter
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check your fluid level

How do you check the fluid level? Good thing to know anyways.

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post #7 of 12 (permalink) Old 03-11-2009, 05:52 PM
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fill plug on the side of the tranny. the 4500 in my 97 started whining one day in 5th, and adding some fluid took care of it. very difficult to diagnose the severity of a wine without hearing it in person though
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post #8 of 12 (permalink) Old 03-11-2009, 05:57 PM
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i was gonna ask about the lugging 5th gear...

i knew it was a problem with the 12v's and knew they tried to upgrade the trans but aparently it is still a problem with the 24v's...

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post #9 of 12 (permalink) Old 03-11-2009, 05:57 PM
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I disagree, and that's ok.

2,600 RPM's is annoying as hell for long drives (winding it too tight). The ISB's start defueling just 200 RPM's higher (2,800 rpm). They are also only rated at 2700 RPM.

Lugging is considered full throttle application for more than a minute when the engine can not accelerate. I routinely take it down somewhere between 1000, and 1200 RPM and accelerate out of it in well under a minute. I'm driving a diesel, not a 1 liter gasser.

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post #10 of 12 (permalink) Old 03-11-2009, 06:01 PM
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Originally Posted by LOW-LIFE View Post
i was gonna ask about the lugging 5th gear...

i knew it was a problem with the 12v's and knew they tried to upgrade the trans but aparently it is still a problem with the 24v's...
It's a problem with the transmission. Both the 12v and 24v have the same nv4500 behind it. Read up on the link I posted before. They know probably more it than anybody else. Basically they say if you keep the engine RPM's above 1600-1800 in 5th gear that it will last longer. I have not seen any proof of this, but it certainly won't hurt anything. Definitely check the fluid level. Use syntorq that you can probably only get from the dealer to top it off with.

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Last edited by Shainer; 03-11-2009 at 06:13 PM.
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post #11 of 12 (permalink) Old 03-11-2009, 06:04 PM Thread Starter
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One more question, what kind of fluid? Is the plug on the left, right, front, rear? I guess thats two questions

Just ordered a cheap used Haynes manual off of Amazon. Are they any good?

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post #12 of 12 (permalink) Old 03-11-2009, 06:32 PM
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The plug is on the passenger side, it takes an allen wrench. Stick your pinky finger inside & the fluid should be just below the bottom of the hole. The fluid you need is called Castrol Syntorque, you have to get it at a dealer or online.

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