Join Date: May 2014
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Driveshaft rumble on acceleration
I've got a '97 F-250 that I bought about 6 months ago. Been slowly working through repairs on it, getting it back in shape. I've done pretty much all of the normal repairs, and today was supposed to have been the last major repair for a little while, I replaced the rear u-joints and the rear pinion seal. I had taken it to an expert diesel mechanic here in town a while back and he had done a bunch of front end work on it, and he had told me the repairs that needed done on the back end, which are what I just finished.
Well, this is my issue. Before I started the repairs, I had a vibration that would kick in at about 65 mph, felt like it was coming from the rear of the truck, so I figured it was those rear end repairs that needed done. Well, now that I've finished those repairs, it's worse, but different. Now, at just over 50 mph I get a solid vibration from not sure where. But the weird part is, it only vibrates when I'm accelerating. Even if I go up to 65, as soon as I let off the gas and coast, even down a hill, no vibration.
When I replaced the u joints, I made sure they had grease and all that good stuff. All the bolts seem tight. The pinion seal I torqued back down to the exact same spot, and there didn't seem to be any play in the bearings, they seemed good. So I have no idea where this vibration is coming from. Any ideas?? I'm relatively new to this, and although I've done a lot of reading and research, and been able to get some expert advice from time to time, this issue has got me totally stumped. I really need to get this fixed by next week, cause I'm moving out of state with it, starting a new job, and need to have this truck in reliable shape so I don't have to worry about it for at least a month or two!! So any ideas would be appreciated!!