Trans/Clutch.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Bernard D, Dec 13, 2020.

  1. Bernard D

    Bernard D Light Load Member

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    Jun 27, 2020
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    Have an 03 Peterbilt 379 .
    (Eaton fuller 10 speed trans /13 speed .)
    Was a Werner truck.
    324 inch WB ? ,
    Baught it that way.
    it's had a transmission replaced as far as I can tell.
    It vibrates under load/ acceleration sometimes to the point of me wanting to jump out and let it go off a cliff.
    Is what I think I should do is just replace trans ,clutch,motor and trans mounts.
    Is that to expressive .
    Would like a few pointers please on what you guys would do .
     
    Rideandrepair Thanks this.
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  3. MRMTRANS

    MRMTRANS Light Load Member

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    Apr 28, 2015
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    A lot of problems can cause a vibration that might seem to be in the transmission when under power: drive shaft issues-needs balancin and carrier bearing; crankshaft dampener; flywheel needs turning; and even collapsing fuel lines. I would start with all the stuff that doesn't require the tyranny to be dropped. Drop the drive shafts -take all 3 to a drives hat shop. Install new carrier bearing and dampener, and replace fuel lines. Unless you know for sure any of these have been done in the last 500k-750k miles, and it doesn't fix the problem, it's good maintenance practice anyhow and should be done.
     
    Rideandrepair Thanks this.
  4. Final Drive

    Final Drive Road Train Member

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    Make sure your truck is sitting level if not it could cause some of those problems...
     
    Rideandrepair and Bernard D Thank this.
  5. Bernard D

    Bernard D Light Load Member

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    Jun 27, 2020
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  6. Rideandrepair

    Rideandrepair Road Train Member

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    I agree with Final Drive, ride height too high will cause grinding while accelerating, or slow rolling forward, too low causes grinding while coasting, or slow rolling in reverse. That’s been my finding anyways. Worth ruling out.
     
    Roger McG Thanks this.
  7. Roger McG

    Roger McG Light Load Member

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    Oct 22, 2016
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    Just for hahas and giggles park the truck on level ground with wheels chocked and brakes released. go around measure the over height of the air bags from paddle to frame. 11 inches is peterbilt spec for air leaf and air track if that is what you have for suspension. Suspension height is adjusted thru the leveling valve. You would be surprised how a little bit of suspension height one way or the other will affect peterbilt drive line angles and create rubbles and shakes that you could spend a ton of money chasing
     
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