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#1
11-06-2004, 09:13 PM
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98 F150 Front End Vibration
New to the Ford corner of the ring guys, so cut me some slack. Just bought a 1998 F-150 reg cab ext bed with the 4.6 and an auto trans and I'm trying to get my bearings. Since I've had it, Higher gear + Low RPM's = Vibration. The previous owner checked what I think of as the usual culprits: changed plugs and wires, had the computer scanned, and even had the injectors flushed. Looking for any other ideas y'all might have before I turn it in to the shop. Thanks.
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#2
11-07-2004, 08:27 PM
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Re: 98 F150 Front End Vibration
FYI: No check engine light is on, and the problem really shows up bad under load right before the trans downshifts.
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#3
11-09-2004, 08:44 PM
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check motor and tranny mounts. It could be the torque convertor not wanting to disengage from lock up.
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#4
11-10-2004, 10:04 AM
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Re: 98 F150 Front End Vibration
Does it feel like it's running over rumble strips, or something similar?
This *sounds* like a classic case of Torque Converter shudder. It can be easily cured with an ATF change unsing the proper fluid (Mercon V ATF). There is a tech article at www.crownvic.net/tech/transservice.htm
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#5
11-18-2004, 12:10 AM
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Re: 98 F150 Front End Vibration
I wish y'all would've been right. Started feeling a vibration at idle today, as well as heard a slight knocking in time with the rpm's. Got out to check, and sure enough, dang thing's shakin' and knockin like I thought. Please tell me it isn't time to fork out some cash, because if that's the case I've got an F150 for sale.
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