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With a heavy heart, something broke in the transmission running along at 80 MPH. 5th gear failed with a horrid grinding sound. 1st to 4th still works find but there is a loose object for sure like a 5th gear nut. But you can't put it 5th it grinds bad.

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Well that sucks!  I thought you had that 5th gear nut situation handled already. 

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Youch!! Does sound like a warraty call. You did mighty good with the OE tranny.

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Posted (edited)

I'm running a upgrade mainshaft all ready but this is not the typical 5th gear nut issue. Both reverse and 5th both create a huge amount of noise. 1st, 2nd, 3rd and 4th are fine. Drove it home the 125 miles at 55 MPH in 4th no issues really. The part that that is concerning if you clutch in and toss it into neutral there is a bangging noise. Then there is something grabbing like attempting to lock up solid. 

 

2 hours ago, Me78569 said:

crack her open and take a look I guess?  or if it is under warranty, time to get on the phone

Warranty long gone. I'm going to get it yanked out and open the tail cover and see what happened. I'm thinking bearing failure possibly.

 

Now that I've got the shop. I could yank that transmission out pretty quick like in about 2 hours. Worlds of difference being on a two post and laying on garage floor. 

 

I've already called Weller Truck in Boise and talked to Abe and he's just waiting for the transmission to be pulled and dropped off. 

 

Edited by Mopar1973Man
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Transmission is out. 

 

Clutch is ruined. Where this whole problem stems from is the pilot bearing walked out of the flywheel and was up against the spline part of the input shaft. The input shaft bearing is loose and worn. The hub of the friction disc is damaged. I've got chunks of the friction disc hub springs laying the bottom of the bellhousing. Flywheel is damaged where the pilot bearing was wearing a new groove. Friction disc is just about at the end of life anyways. 

 

I wasn't able to get one bolt out of the rear cover. I wanted to look in there so bad and see 5th gear damage.

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On 8/27/2019 at 9:06 PM, 01cummins4ever said:

I feel your pain, seems to be a bad month for trannys around here. 

I'm not going to drive mine again til the end of August for this reason alone! :thumb1:

 

Sorry for your misfortune Mike...I've pulled a 4x4 nv4500 before and those cast iron pigs are heavy! 

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Posted (edited)
33 minutes ago, dripley said:

Is the 4500 cast iron?

Yeah buddy...all except for the top cover.  I would estimate by memory up to 300lbs.  I think the nv5600 is closer to 400lbs.

Edited by Bullet

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44 minutes ago, Bullet said:

Yeah buddy...all except for the top cover.  I would estimate by memory up to 300lbs.  I think the nv5600 is closer to 400lbs.

Did a little looking and the 4500 is 195 vs 360 for the 56000. Thats why I did not think it was cast iron. I have pulled my 5600 a couple times, it is beast. They are both a beast with out a lift and in a gravel drive way.

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1 minute ago, dripley said:

Did a little looking and the 4500 is 195 vs 360 for the 56000. Thats why I did not think it was cast iron. I have pulled my 5600 a couple times, it is beast. They are both a beast with out a lift and in a gravel drive way.

Damn I must be getting old cuz it felt heavier than that.  It is very dense for its physical size. 

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Posted (edited)
12 hours ago, Mopar1973Man said:

About 130k miles.

 

That's pretty good for a stock type clutch disk and your power level. I went with a stage one upgrade when I did mine. It is a little noisy at an idle with gear rollover. It will be interesting to see what the tranny looks like. Picture of my stage one clutch disk (Sachs) and oem flywheel.

 

 

 

 

downsized_0711021143.jpg

Edited by NIsaacs
Add picture

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Posted (edited)
1 hour ago, NIsaacs said:

That's pretty good for a stock type clutch disk and your power level.

 

South Bend Con OFE clutch this was my second one.

 

1 hour ago, NIsaacs said:

I went with a stage one upgrade when I did mine. It is a little noisy at an idle with gear rollover.

 

The Mobil 50 SAE transmission fluid stops the gear roll over noise completely. Silent operation.

 

After seeing the pilot bearing not in the flywheel I knew there would be other problems. I promise I'll get photos one way or another. I'll talk to Abe as well about that. 

Edited by Mopar1973Man

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54 minutes ago, Mopar1973Man said:

 

South Bend Con OFE clutch this was my second one.

 

The Mobil 50 SAE transmission fluid stops the gear roll over noise completely. Silent operation.

 

 

 

If you upgrade the disk hub, Mobil 50 or not, you will get noise. My tranny was quiet too, with my stock clutch. Your clutch looks like a plain jane 13125 (13" x 1.250" spline) stock type Luk. Better than the 12.3" it was born with, but not much. With your power level I would move up some. I would guess that clutch to be rated about 400/800. You need one in the 450/900 range+

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This new SB organic DD I got is smooth as butter on take off. It can be a little tough to get into gear from a stop and it is definitely slower shifting but it holds power at my level no problem. I ordered from DAP and it came fed ex the next day at no extra charge!

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Sorry about the news Mike...

 

I'm curious to see what you find about the 5th gear.  I learned years ago that the upgraded fully splinned 5th gear shaft is not really an "upgrade", because all these aftermarket parts come from China and their metallurgy is so bad that most rebuild parts are weaker than OEM.  Sad thats all we have to choose from but thats another discussion...

 

Also, I want to know why the pilot walked.  There's no reason this should have happened.

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