Truck problems with violent shaking please help?

heres the senario, I have a 95 f150 4×4(locking hubs) with 260K on it. When I go between the speeds of 50-60 my truck shakes so violently that it feels like a jet plane is taking off beside me. hubs are on (free and in 2wd) It is not Ujoints and it is most definitly not and tire or wheel balancing. I know this because I recently got that work done. The shaking only happens when pressing the gas pedal at the speeds mentioned above. If I am in neutral going down a hill it is smooth riding but if I press the gas between 50 and 60 km.h it shakes violently. Its not gear either in 4th or 3rd I’ll experience the same thing. (its a 5spd)

I was on ice today not moving and I accelerated to while not even moving ant the shaking occured! I was stationary and only the back tires were spinning yet the shake occured between 50-60km/h
someone with experienc please help..

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7 Responses to Truck problems with violent shaking please help?

  1. ssg/emt June 8, 2010 at 9:37 am #

    Before you go replacing expensive drive line components, have your tires balanced. Out of balance tires usually produce vibration at specific speeds.

    Make sure you don’t have mud or ice packed inside the rims, that will also unbalance wheels, and make sure all lug nuts are present and tight.

    Always check and fix the simple stuff first.

    After the tires, check the rear drive shaft, it is usually the first to wear out, since it gets the most use. If the drive shaft is bad, you will often hear a "clang" when you shift into gear and release the clutch. with the truck shut off in neutral, and the wheels chocked, grab the shaft, rotate it back and forth and lift it up and down. Watch for play in the u-joints.

    Other things to check would be loose suspension components and engine/ transmission mounts. My bet would be on the tires though.

    Good luck.

  2. neighborhood guy06 June 8, 2010 at 9:37 am #

    Sounds like U-joints to me, but if you have ruled these out I would check my motor mounts. You said it happened when you were spinning tires but not moving so it has to be in the drive train. The other possibility would be an out of balance drive shaft or worn rear end gears, but my money is on the mounts. If your mounts are bad, check your front CV joints for wear. Learned that lesson the hard way. Good luck!!

  3. Mr. E June 8, 2010 at 9:37 am #

    Check the ball joints. My car did that at high speeds and it turned out to be ball joints.

  4. Delta_1980 June 8, 2010 at 9:37 am #

    have your carrier bearing checked out

  5. halsca June 8, 2010 at 9:37 am #

    Could be your drive shaft lost a balancing weight. Might be a rear wheel bearing too. Take the drive shaft to your nearest outfit that specializes in that sort of work and have it rebalanced.

    If the shaking happens while stationary you can pretty much write off any problems with the front end.

  6. partyguard June 8, 2010 at 9:37 am #

    Does it make a difference if you’re accelerating at that speed, or if you’re cruising at 50-60 km/h? If it only happens on acceleration, it could be bad engine or trany mounts. Hope this helps.

  7. Martinmm June 8, 2010 at 9:37 am #

    dual drive line, Carrier bearing.transmission.its not the eng or you would have said.i would check your books on the tranny electronic switches.Here you go have it code least you can eliminate it.DON’T DOWN LOAD THAT GUYS VIDEO