Are you sure it's the engine that's vibrating. What happens if/when driving down the road you shift into neutral while doing 45-50 and you let the engine idle drop? Only do this of course on an uncrowded road since your focus will be on how the truck/engine/front end reacts to doing this. When the engine idle drops yet the truck is still moving at 45 plus, does the vibration go away? If the vibration DOES stop then it's probably an engine problem and most likely not a bad suspension or drivetrain component. Doing this you're also not involving the tranny so if that stops when you go into neutral then it could be the tranny. Don't do this if you're not used to performing these road warrior type tests.
Everything Bill said and if an automatic the torque converter and torque converter lickup solenoid can be bad causing vibration at those speeds . Overdrive clutch packs glazing and slipping causing shuddering . Does it have a tachometer or RPM gauge ? If so watch what it does when vibrating . If it is erratic it may be a misfire issue . If it jumps up in RPM it may be a transmission issue .
Everything Bill said and if an automatic the torque converter and torque converter lickup solenoid can be bad causing vibration at those speeds . Overdrive clutch packs glazing and slipping causing shuddering . Does it have a tachometer or RPM gauge ? If so watch what it does when vibrating . If it is erratic it may be a misfire issue . If it jumps up in RPM it may be a transmission issue .
Lockup solenoid
How much do U think that cost to fix?
Rock Auto had the converters for $260 as a front and rear two piece assembly . Ask around to see what they will qutoe doing the install if you supply the cats . I spent $450 for four cats for my Ford where the dealership wanted $2500 for four factory cats .
And cats is short for catalytic converters . Don't want people thinking I stuffed cats in my exhaust : )
My cat converter is one piece according to the Dodge dealer. Thank you so much for your input Mr. Robert Wood, Thank you.
Also if the cat is clogged causing backpresuure, as Bill said also, this can cause misfire and rough running at speed . Have the cats fixed and drive it before paying unnecessary money .
Money that may be wasted if the cats are causing the issues .
Also, have a friend go with you so they will not think they can take advantage of your situation . Some, not all, shops do take advantage of ladies and retirees . Try to get an estimate in writing also for your benefit .
It has the RPM meter
V8 Magnum, 4.7 engine
×
Low fuel pressure causing random misfires
problem crank/cam position sensors
problem EVAP not venting the fuel tank properly
failing cat converter blocking the exhaust
The linkage to my 4X4 transfer case is broken and there is TOTAL slack in the 4X4 shifter so would that cause the vibration? My catalytic converter is also bad. I'm in the process of fixing it & getting quotes on the cost for both issues.
Needless to say, I'm NOT driving it until fixed.
unlikely that bad shift lever bushes and ends would cause the vibration
that would only act as a signifier or a resonator for the problem
as for the cat converter being bad , that can cause problems as the both oxygen sensor are affected and that results in ECM control problems
what is a resonator? OMG I can't afford to buy a new vehicle I live on a fixed income.
Check with Rock Auto online for the catalytic converter as it will usually be cheaper to order one from them and have an exhaust shop install it .Always price check several places .
no mention of buying a new vehicle
just a lot of suggestions as to what the problem might be
find an accredited service center with experience on your make of vehicle
you are armed with possible solutions so discuss them with the mechanics and get a quote for any suggested work to be done
You will see that there are suggestions that will "raise the red flag" when a mechanic starts talking whole component replacement as it will not sit right with the suggestions you have in hand
Thank you Mr. Boyd, your advice has been very helpful. Merry Christmas.
I love my truck and smaller trucks aren't being manufactured anymore so, gotta keep it.
a resonator is something like a tuning fork
small vibrations at one end produce large vibrations at the other and make for distractions and other problems
so a small looseness at the transmission will produce large movements at the knob end making you think something major is happening
×
Motor mounts could cause this.
SOURCE: vibration at 75 mph
Must be bad u-joint. To check it, let off the gas pedal. If it stops right away, it's the u-joint. If it takes a few seconds, it's a tire out of balance, or a bent wheel.
SOURCE: 2000 Dodge Dakota vibration while driving
sound like the u-joints in the driveshaft. Lay under the truck and where the u-joints are try moving the driveshaft up and down. If it moves then the u-joints are bed. This will cause a tremendous vibration under a load and the faster it spins it will smooth out.
Testimonial: "That's pretty much what I thought. Just trying to get some feedback about what I already suspected."
SOURCE: During highway driving, my 2005
check your engine support, if it is ok check your tie rods and stabilizers or might as well have your wheels aligned...
SOURCE: During highway driving, my 2005 Ford Excursion
I would first check the u-joints on the driveshaft if the problem only happens when the speed is between 62-75mph. Then check all the tires for lumps or bulgesin the sidewall or tread surface. The tires may also be out of balance and bouncing at that speed. If the vibration occurs only when the engine is around 2000rpm, check the pulleys, serpentine belt and anything driven by it for looseness. Also, check the trans mount to see if it is loose or broken. If everything checks out ok, have the OBD codes checked to see if anything might be causing the engine to surge.
220 views
Usually answered in minutes!
Automatic or manual transmission ?
Automatic w/Over Drive on the PRNDL. 4X4 on the Floor, it's the oldie style, Not high-tech computerized BS. I don't want their new high-tech BS.
If you can drive it down a straight stretch of road with it warmed to operating temp and get it to the speed it vibrates at , keeping your foot steady on the gas lightly touch the brake with with your left foot and it will disengage the lockup converter . If the vibration stops when you do this it may be the converter itself which is cheaper then a clutch rebuild . As Bill said, eliminate any misfire issues first as a ignition or injector misfire at load feels similar to a bad transmission .
How many miles are on the truck ?
188,000 Miles are on it, but body & interior of it is in excellent condition. I put a custom stereo & Polk speakers in it too. Just put new Cooper tires on it last fall..
I always keep up on the maintenance in all my vehicles, but this has me worried cuz they don't make small Dakota Sports, 4X4 V8 with extended cabs. I love my truck It usually drives like a cadillac.
Automatic.
V8 Magnum, 4.7L engine.
4X4 on the floor.
×