Last post on Apr 26, 2002 at 2:43 PM
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Ford F-150, Truck
#2 of 10 Vibration under load ?
Mar 23, 2002 (10:29 am)
I would highly suspect the torque converter OR possibly and engine mount resonance problem of some sort. I had a strange problem like that once and it turned out to be a very lose engine mount on the driver's side. In a GM vehicle, a torque converter problem (in a 4 speed Turbohydromatic with o/d) the vibration occurred at abut 45 to 50 UNDER LOAD, like your problem. They ended up replacing the torque converter. ALSO, DOUBLE CHECK to MAKE SURE the tranny fluid is a) at correct level and 2) the CORRECT FLUID. Take NOTHING for granted in a new vehicle.
#3 of 10 re : ferdsford
Mar 23, 2002 (8:20 pm)
It sounds like a torque converter. I had a 99' ram & the exact same thing you described happened to me TWICE !!! I had so many problems with that ram. I switched to Ford & got a F250, love it !!!
Have the dealer do a load test on the torque converter.
#5 of 10 My 2001 Super Crew has it
Mar 24, 2002 (7:45 am)
A slight vibration at the speeds mentioned.
After I lowered our truck 2 inches all around , I had to shim the differential to correct the pinion angle. THe vibration was quite bad before I shimmed the diff.
Normally a vibration under power the pinion yoke angle is too high. If the vibration is on deceleration the angle is low.
Your trouble may not be the angle of the drive shaft. Just some random thoughts of mine.
If I am on the throttle hard(3/4 or WOT) the vibration is very noticable.
My Ford truck is a 5.4 , 4x2 unit.
FWIW , I also own a 2000 1500 Silverado 4x2. If I get a heavy load or trailer on it the truck vibrates your teeth out in first gear. The dealer's answer was "add air bags".
The real problem with the chev is when a heavy load is added.... from the center support bearing of the drive shaft to the diff the drive shaft is actually pointing up. This puts a real bad angle on the u joint. When power is added the diff nose moves up and makes the angle even worse.
#6 of 10 Vibration solution
Mar 24, 2002 (11:04 am)
Turn off the CAPS LOCK and the vibration will go away.
#8 of 10 2001 F-150 Supercrew 2x4
Mar 24, 2002 (11:29 pm)
Have vibration in speed area of 40-50 mph, feel it in the body more than the steering wheel. Dealer claims unable to find cause. So far they've rebalanced wheels, driveshaft and put a rubber damper on tranny mount. They claim Ford doesn't have any service bulletins on it.Any possible solutions can take to them would be appreciated. Thanks
#9 of 10 vibration re ferdsford
Mar 25, 2002 (5:26 am)
The problem with vibration on the crew cabs has been the change in driveshaft and angles from the regular and extended cabs. This issue exists not only with Ford trucks but with other makes also. Since dealer has already changed the driveshaft twice, you may have to live with the vibration in your SCrew. crosley4 is gives good advice and if you know of any mechanics that have corrected driveline problems with lifted trucks they would be a good resource. It is more of an art than a science to fix this type of issue.
#10 of 10 Did any of you S Crew
Apr 26, 2002 (2:43 pm)
owners get your vibrations fixed?