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Truck Repair/vibration transmission

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Question
HI I have a 2001 peterbilt N14 460 hp with a meritor 10 speed smart torque 2 trans. I had a new clutch,throw out bearing ,clutch brake and 3 u joints installed about a month ago I just finished a trip dropped the trl. and started to bob tail home when I put it in 8th gear and stepped on it I felt a vibration and like a bit of a growling noise I let off and tried it again and it didn't really do it then I kept trying slowing down and go through the gears  if you let the rpm drop to around 1200 and stepped on it, it would start the growling noise and vibration as soon as you felt the tubo kick in then let off it would stop any help would be great thanks Jeff

Answer
I would first check your leveling valve in the suspension look at your air bags and make sure they are sitting about right not all the way up or all the way down. After that would check all your u- joints and carrier bearing for any up and down movement and also check your slip joints in the driveshaft make sure they are still slipping and not frozen up. I would doubt its in the transmission as long as your fluid is normal seldom do the bearings in the trans go bad. more then likely its one of the above just transferring the vibration up to the transmission.

Truck Repair

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Jeff Drumm

Expertise

I Can answer any question pertaining to semi trucks and trailers. Have no experience in the automotive field so not able to help in that area.

Experience

My experiences in Semi Trucks is. I own my own truck and i presntly maintain a 80 truck fleet. Can handle any questions pertaining to a truck have tore apart and rebuilt every aspect on them. Fleet I deal with is Mainly Volvo trucks and a handful of freightliners. Work on automated transmissions on a daily basis along with carrier apu's. With engines my specialty is the 60 series Detroit but do work on the cummins isx the n-14 and the ism. and also the Volvo engines.

Education/Credentials
Have a College Degree from university of northwestern ohio in diesel and agriculture mechanics. Have 10 years behind the wheel driving a truck and 4 years working on trucks full time. Also have grown up on a farm so have been tinkering on trucks and tractors all my life.

Awards and Honors
I've gone through online schooling and have received certificates from webb wheel, Timken and Volvo academy.

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