Jump to content

NV4500 broke...

Posted
  • Owner

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.

    • Sad 1
    • Replies 79
    • Views 9.4k
    • Created
    • Last Reply

    Top Posters In This Topic

    Popular Days

    Most Popular Posts

    • NIsaacs
      NIsaacs

      No, overdrive (6th) is inside the case, better support and it is a bigger tougher tranny all around. The issue with the NV4500 is 5th gear is outside the main case. So any slight bearing slack on the

    • KATOOM
      KATOOM

      We obviously dont agree but based on the pictures and information I've seen so far, I do not believe the pilot walked out of the flywheel on its own.  I think it was drawn out by the wiggling input sh

    • KATOOM
      KATOOM

      DONT float gears in these transmissions.  This discussion has been hashed out for years and seems to get very heated depending who's defending what position...but no matter, it still stands as a FACT

    Posted Images

    Featured Replies

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

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

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

    • Author
    • Owner

    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

    • Like 1

      If I was at the McCall RV Park I’d come over and give you a hand.  

    • Author
    • Owner

    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.

    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! 

    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

    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.

    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. 

    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

    • Author
    • Owner
    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

    Go to topic listing