Vibration Diagnosis

my 98 volvo does the same thing going uphill feels like the truck is going to fall apart !

 

I can tell you all 80% of the problems with vibrations is junk Eaton Fuller transmissions. I had 5 new Volvo's in 10 years at old job and they all had terrible vibration issues. You know a brand new truck and you can feel the "growl" in floor board and steering wheel stopped idling. When you start rolling it's vibrating the wheel and makes you feel half sea sick after 100 miles. I now have a 16 junkliner and same problem. It has to do with sloppy tolerances and now they use automatic transmission fluid I believe. As long as truck manufacturers have been slapping Eatons in them their is absolutely no excuse for this problem!! Bottom line is Eaton is making a nice profit along with the truck manufacturers. The one stuck in the middle is us drivers, these new trucks all vibrate and handle terrible. I drove an 97 Mack with a Mack transmission and I never had this problem with it, only truck on 15yrs. Hey Eaton maybe you should have Honda design a truck transmission for ya. Someone should a pitbull law firm and go after Eaton and truck manufacturers using them under a drivability lemon law. As long as the profits are high and most units make it past warranty they don't care. These engineers can stop patting them selves on the back and go back to the drawing board. No excuse.

 

Automatic transmission fluid in Eatons? Same 50w they have been using for years. ATF is closer to a 10w. I have had Eatons for over 2 decades and not had any issues. The Eaton 18 in my current ride has been stellar, and it is a factory reman. Not a bit of vibration problem in 639,000 miles.

 

Oh com on! Really.
Most all vibration problems are in the driveline . Angles not correct ; ride hights ect..
This in turn sends pulses up thru the trans . Can make the contershafts viberate and wierd noises come up the stick.
Atf in a eaton manual box. Wow , first time ive ever heard this.

 

Need to ignore these single post rants from brand new members.

 

Need some cheese to go with that whine?

 

This OP is from 2011. Someone dug this up from the grave. Anyway..Too much butt-dyno here.

Want to figure out what the vibration really is? Hook up an EVA (engine vibration analyzer). Determine if it's a 1st, 2nd, and/or 3rd order vibration. Could be tire/drum, crank, driveshaft (weight/angle/midship/out of round/Ujoint), engine/cab mount. See how endless this can be?

How many driveshafts do you have? Do you have a midship bearing? Do you have a tandem axle? You could have the splines on the interaxle not lined up correctly. What are your driveshaft/engine/axle(s) angles? Laden...unladen? What road speeds does it vibrate at? Can you drive through it or does it get progressively worse? Does it change with a different gear?

If anyone ever wants to inquire about "vibrations" on their trucks again. Get an EVA, or, in this case, send it to a certified STL (FTL or WST) dealer.

 

I used to have a lot vibrations on my Volvo 2006 specially after acceleration and up the hill. The problem gone when I found my trailer tires was really bad. I replaced 6 of them and the problem gone. Yes I do have also little vibration on idle,but I know that's should be from the engine mount %90. I was replaced that mounts on my older Volvo 2005 long time ago and any kind of idle vibrations just stop. Also the truck was driving and accelerating like new. So the engine mounts, tires, shocks and the air back are really important for the truck vibrations. Sometimes when the air backs get old and start to leak air even little bit the valve controlling the air pressure in the backs start to inflate more air in the leaking back. That's cause anothe type of vibration. Was happened to me one time. I am hopping can help somebody with all of this cumming from my experience.