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Old 09-14-2003, 01:16 AM   #1
Scooby Specialist
Member#: 7074
Join Date: May 2001
Chapter/Region: MWSOC
Location: Illinois
Default Evaluating '99RS drivetrain

I'm sure this is not normal. Today I had my '99RS up on 4 jackstands to evaluate some unusual noises coming from either the drivetrain or specifically from the wheel bearings. I believe there is a bad diff or diffs on the vehicle. Get this, I had an associate of mine drive the car in first gear, the drivers side hubs spun freely and smoothly at 2,000 rpms. I walked over to the passenger side (which was recently damaged by a hit to a curb at about 25-30 mph) and saw the front pass hub spinning at 1/2 the speed the drivers side and the rear pass hub was barely moving at 2,000rpms, basically it was spinning in slow increments and pausing.
Another item was when turning slowly in a tight radius the drivetrain made a loud thunking noise consistently with speed, you could feel it through the pedal. On the street I hear a subtle wine coming from the rear of the vehicle, also consistent with speed (faster with increased speed, slower with decreased speed)

I think the rear diff is shot, but I have yet to determine if the front, or center is as well.

And I thought all I needed to make this vehicle run again was a new shortblock which I recently completed installing

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Old 09-14-2003, 03:24 AM   #2
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2007 FXT
WRB SPB Edition


Actually one front spinning faster than the other is normal, same goes for the rear. That's exactly how mine did when I had it lifted.

Also are you sure the clicking was coming from the drivetrain and not a cv joint??
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Old 09-14-2003, 09:54 AM   #3
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Join Date: May 2001
Chapter/Region: MWSOC
Location: Illinois

It may be a cv joint, wheel bearings, etc. There really was no clicking, I first heard a constant wine after I got the vehicle back on the street (just reinstalled a new shortblock). Drove her around for a while to make sure everything was o.k. and heard some unusual drivetrain noise. I checked the rear diff by spinning it when the car was up on stands and everything seems smooth. I just replaced all the fluids in the vehicle and considering the body/chassis/drivetrain has 86,000 miles it may have some wear and tear I can't see. The vehicle was previously in Colorado and Nevada, very dry and hot weather has beaten all the rubber parts on the vehicle.

It is normal for the rear passenger hub to spin slow and pause while in gear at low rpm?


Last edited by JayGold; 09-14-2003 at 10:06 AM.
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Old 09-14-2003, 12:05 PM   #4
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normal, you have open diffs in the front and rear, not all the wheels will spin at the same speed.

if yo had an 00-01 both rear wheels would spin at the same speed, because they have a rear LSD

while one front would spin faster than the other because the front is still an open diff.

The whine from the rear is most likely a wheel bearing, as for the thunking on turns...hard to say, most of the time a cv joint will click.

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