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06-28-2007, 09:16 AM
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CC Member
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Join Date: Feb 2004
Cobra Make, Engine: FFR 390 toploader IRS
Posts: 258
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Not Ranked
Top Loader "rumble"
Once in a while will cruise'n on the hi-way, fourth gear, the trans will start to rumble. Slight vibration, sounds like a bad bearing but then goes away.
Not sure on the mileage as I bought it used. Any idea's????? Time for a rebuild???
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68 F100 Custom Cab 418 cube FE/auto
99 SuperDuty Tuner/chipped/4" Banks TOTALED!!
02 Super Duty 7.3L
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06-28-2007, 09:40 AM
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CC Member
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Join Date: Apr 2004
Location: Scotts Valley,
CA
Cobra Make, Engine: ERA 289 FIA #2108
Posts: 1,882
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Sure it isn't sound/vibration transfer from the differential or u-joints? I'd climb under and see if there is any excessive play in the differential or u-joints.
What rpm does it usually vibrate at? Can you duplicate the effect with the driveshaft disconnected?
DD
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Dangerous Doug
"You're kidding, right?"
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06-28-2007, 10:02 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Driveshaft out of balance at that speed maybe?
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06-28-2007, 08:16 PM
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CC Member
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Join Date: Feb 2004
Cobra Make, Engine: FFR 390 toploader IRS
Posts: 258
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Not Ranked
If drive shaft it would do it all the time. U-joints and rear are fine. It's definitely trans. It's only done it in fourth gear at cruise speed (60-70mph) 2600-3000rpm range.
__________________
FFR MarkIII,FE,toploader,IRS,3.27,Vintage pin's SOLD!
68 F100 Custom Cab 418 cube FE/auto
99 SuperDuty Tuner/chipped/4" Banks TOTALED!!
02 Super Duty 7.3L
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06-29-2007, 04:03 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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I disagree, if a driveshaft is out of balance at a certain rpm, it will vibrate. I had a 2002 Mustang GT that I put a 4.10 gear in. Since the driveshaft was spinning fast wtith the low gear (and it wasn't balanced for it), at about 85-90, it would be spinning in a range where it would vibrate the rear of the car.
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06-29-2007, 06:59 AM
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Member of the north
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Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,207
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I just lost a weight off the flywheel. It has a RPM attached to it...very anoying.
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06-29-2007, 08:14 AM
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CC Member
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Join Date: Feb 2004
Cobra Make, Engine: FFR 390 toploader IRS
Posts: 258
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Not Ranked
Quote:
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Originally Posted by blykins
I disagree, if a driveshaft is out of balance at a certain rpm, it will vibrate. I had a 2002 Mustang GT that I put a 4.10 gear in. Since the driveshaft was spinning fast wtith the low gear (and it wasn't balanced for it), at about 85-90, it would be spinning in a range where it would vibrate the rear of the car.
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By all the time I mean at the said rpm. Doesn't alway's do it at said rpm. Only once in a while then stops without rpm change.
__________________
FFR MarkIII,FE,toploader,IRS,3.27,Vintage pin's SOLD!
68 F100 Custom Cab 418 cube FE/auto
99 SuperDuty Tuner/chipped/4" Banks TOTALED!!
02 Super Duty 7.3L
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