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Thread: 5 speed manual trans failure

  1. #1
    Join Date
    Jan 2008
    Location
    New Jersey
    Posts
    50

    Default 5 speed manual trans failure

    Hey guys,
    I was driving today when i heard a loud bang from the trans. The truck came
    To a stop and that was all she wrote. The clutch pedal feels normal and i am able
    To shift thru the geas without any grinding. I am thinking that the input shaft broke.
    I was wondering what your thoughts are and how difficult is it to replace the
    Input shaft. Pulling the trans is no problem along with clutch replacement, but I
    have neve tore into a manual trans. Thanks

    1994 k3500 4x4 dually 5 speed manual 95k

  2. #2
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,806

    Default

    Broken something should continue to make a noise. I have not seen a broken input shaft, but clutches come apart.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  3. #3
    Join Date
    Feb 2007
    Location
    Lincoln, NE USA
    Posts
    712

    Default

    NV4500's have been known to have 5th gear/output shaft failures due to lubrication issues. Gear oil level is critical. There are aftermarket gear sets that solve this by drilling a dimple on the face of three teeth to act as a "pump" to pull the lube up onto the 5th gear and shaft. Manual transmissions are pretty straight forward to tear down and rebuild, GM shop manual is the best out there.
    Last edited by Husker 6.5; 12-05-2012 at 04:36 AM.

  4. #4
    Join Date
    Jun 2008
    Location
    Burnet durnet Tx
    Posts
    911

    Default don't know

    bout nv4500,on older 4by models there is a coupler shaft that joins the tranny output shaft to transfer cases' input...when that breaks..tranny works normally but no go...just sayin
    ..93 3500HD 200h 4L80E 4.88..11150lbs allatime..88 c.c. dually..6.2..auto w/doug nash 2-sp..camo paint...58 A120 4by IH{old vfd brush trk} 71ford p/u 79 shovel {{{ hooorraaayyy the bus is gone}}} 93 2500 parts truk {gone to that great chrusher in the sky 01 burban{wifes'.."no you can't use mine"}

  5. #5
    Join Date
    Mar 2007
    Location
    Devils Lake, ND
    Posts
    363

    Default

    Agree on output shaft.... too small. There is an
    upgrade that can be done.

    But usually the ol' 6.5 doesn't have enough poop to
    break it.
    1995 Chevy 3500 6.5 TD
    *Heath 80 HP chip
    *Warp Speed 4" Exhaust
    *Bully Dog Pillar gauges
    *Cooling Fan Upgrade
    *Air Cleaner Upgrade
    *Turbo Master


    1995 GMC 3500HD 6.5 TD 16 foot Flatbed
    *NV4500 Trany Recent Rebuild
    *Glow Plug Upgrade
    *4" Heartthrob Exhaust w/no muffler (turbo back)

    1981 VW PickUp (Caddy) (48 MPG)
    *Drop in Turbo D engine
    *15 gallon tank
    *81,000 original miles on body

    1986 VW Jetta Turbo D (42 MPG)
    *Rebuilt Trany
    *190,000 with one family

  6. #6
    Join Date
    Jan 2008
    Location
    New Jersey
    Posts
    50

    Default 1994 trans failure

    Hey guys,
    I finally tore down my truck. The transmission output shaft is finished.
    The splines are all wore out. Finding parts for the nv 4500 is no problem, however finding an input carrier assembly (planetary gear and input shaft) is turning out to be very difficult. If am going to repair the truck I have to replace
    the input shaft on the bw 4470 transfer case. I have been looking all around for
    parts with no luck. Any suggestions were I might find a used input shaft?
    Thanks
    JIM

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