Vibration update
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Senior User
Joined: Jun 2007
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Vibration update
Thanks to those of you who offered suggestions to fix my vibration. Here is what it turned out to be. I took my truck to two different transmission places and a differential place three times. I had a bad vibration from 40 to 50 mph under power only. I ended up getting the drive shaft balanced because it was bent but the vibration remained exactly as it was prior to the work done on the drive shaft. I took it back to the differential place and they started taking stuff off to isolate the problem. It turns out in no particular order that the 5 -10 mm bolts that hold the middle of the transmission together near the transverse case were loose. This is where my leak was as well as my vibration. Once those five bolts were tightened the Vibration was gone and the leak was gone. I would like to think it was drive shaft vibration that loosened the bolts however the vibration was unchanged after the drive shaft was repaired. So I am not sure what to think. So thanks again the problem is solved.
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Senior User
Joined: Jun 2007
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Vibration update
Well you bring up an interesting point. I would really like to believe that my out of balance or bent drive shaft caused the bolts to loosen. That would be perfectly understandable to me. I do find it hard to comprehend however that once the drive shaft was fixed the vibration was exactly the same. By that I mean the mph the rpm nothing changed concerning the vibration. Now this just might be an indication of my ignorance concerning this kind of stuff but I would like to believe that once the drive shaft was repaired that the vibration would have changed in a noticeable way.That leads me to think that the bolts were the issue all along. I don't have an honest explanation for that one. I trust the differential place because they found the problem and when they looked at it in the beginning the truck was never out of my site. I test drove the truck with them and we talked about what it wasn't. But hopefully I caught in time that there wasn't any damage done to the transmission.
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Joined: Sep 2006
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i wonder if this is the same problem im having...when i punch it down to the floor, when it seems like its ready to shift it begins to jerk slightly back and forth until it does shift...and when cruising about 40-45 mph, if i gradually speed up, it will begin to jerk again
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Joined: Dec 2007
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From: royal oak, mich
I used to work in a shop where we made rotating assemblies for drivelines and also balanced them(along with what ever came thru the door) and it sounds like the balance weight may have come off the driveshaft and vibrated the bolts loose which in turn magnified it all. We would balance individual transmission parts to production tolerances. This was done at as friggin fast as possible so some got an oops now and then. The same with driveshafts, axles and crankshafts. When the driveshaft was rebalanced the loose condition with the bolts had already started. Rechecking the shaft had definitely ruled it out. I hope the bolts had some Loctite was used when tightening them back up.
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im having the sam eproblem with my 97 f-150 when i punch it down to the floor, when it seems like its ready to shift it begins to jerk slightly back and forth until it does shift...and when cruising about 40-45 mph, if i gradually speed up, it will begin to jerk again
