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1 23rd August 09:06
kenb
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Posts: 1
Default 2001 Ranger --- Limited-slip rear end noise?


Hi Guys,

I have a question that concerns the limited-slip rear-end in my 2001
Ranger, which has the F6 axle code on the sticker on the drivers side door
post. This truck is equipped with the 3L V6 and the 5 speed standard
transmission, and currently has 145,000 KM on the odometer.

I started hearing a noise from somewhere back there about a month ago
when taking off from green lights. Although I have never burned any rubber
with this truck, I generally don't waste too much time getting on my way off
the line, so I guess my driving style could be described as semi-aggressive.

The sound is a difficult one to describe (can't seem to think of
anything else that sounds like that), but it happens at exactly the same
time as I'd expect to hear a back tire spinning on dry pavement if I had put
my right foot into it hard enough. I should also mention that I've heard it
happen when driving in reduced traction conditions like snow and ice, so I
doubt that I'm hearing a back tire burning rubber or anything like that.

This sound only occured off the line previously, but the other day I
heard it again when shifting into second gear. This sound isn't anything
very loud either, as I doubt I'd even hear it if the radio was on at a low
volume setting.

I suspect I'm hearing the clutch packs spinning in the limited slip
diff, and I was wondering what you guys think. Since it happened when
shifting into second the other day, I'm also anticipating that it is likely
going to get worse over time.

I have a few questions about this:

1) Do you think these symptoms sound like something that would point to the
chutch packs in my limited-slip diff?

2) Is this a Ford 9 inch rear axle like the old days, or is this another
design altogether?


3) Is this big money to deal with parts and labor-wise, or will the repair
job be something that won't scare me too much financially?

4) Is this something that can be put off for a while, or would it be in my
best interests to get on it right away before any more damage is done, like
a set of almost worn-out brake shoes that are just about ready to carve some
nice deep grooves into the brake drums?

If I was younger, it was summertime, and I didn't mind the smell of
differential lubricant so much, I'd probably consider going in there myself.
Since I strike out on all three scenarios, it looks like I'm going to pay
someone else to do it this time around, so I'd like ask you guys what you
think.

Cheers,

Ken

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2 23rd August 09:06
cjb
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Posts: 1
Default 2001 Ranger --- Limited-slip rear end noise?


Since you didn't try to even describe the noise, it's not easy for me to
guess. Having recently had clutch pack trouble with my towing package E-150
Chateau, I am familiar with several noises. ;-)

I do suspect that the noise is from the clutch packs. If that's the case,
there's no danger in driving it. The worst thing that will happen is that
the l/s will become inoperable and start behaving like an open diff.

I can also tell you that the first thing anyone's going to suggest is just
to add some more anti-slip additive. That often quiets noisy clutch packs.
Have you even looked underneath to see if the diff is leaking? Have someone
lift the truck, check the level, and add some limited slip additive. I'll
bet that quiets things down nicely.

CJB
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3 23rd August 09:06
kenb
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Posts: 1
Default 2001 Ranger --- Limited-slip rear end noise?


OK, I'll try harder to describe it! ;-) It could be described as a
short "shunt" sounding kind of sound (did that make sense?), nothing
metallic or anything, and only lasts for a fraction of a second or so.


No leaks, and the truck looks and drives like it was well mantained and
pampered by the original owner. Thanks for the fast reply CJB, the news
sounds good to me so far. I'll look into the anti-slip additive.

Cheers,
Ken

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4 23rd August 09:06
cjb
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Posts: 1
Default 2001 Ranger --- Limited-slip rear end noise?


On the 3 or 4 Rangers I've had, they all exhibited a little noise in the
rear suspension after a while. It may just be the movement of the
suspension.

CJB
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5 23rd August 09:47
steve barker
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Posts: 1
Default 2001 Ranger --- Limited-slip rear end noise?


The LS clutches won't come into play unless you're spinning a tire or
turning a corner. I suspect what you are hearing is slip spline bind and
release on the drive shaft. Pull the slip joint apart and lube it with a
GOOD moly based grease and put it back together. See if the noise has gone
away or changed.

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Steve Barker
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6 23rd August 09:47
cjb
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Posts: 1
Default 2001 Ranger --- Limited-slip rear end noise?


Doh! How could I forget that... You're prolly right.

CJB
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7 23rd August 09:47
steve barker
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Posts: 1
Default 2001 Ranger --- Limited-slip rear end noise?


I should have gone on to say IF the noise is changed or gone, then replace
the slip yoke. The new ones have a nice nickel coating on the splines that
helps prevent this problem.

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Steve Barker
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8 23rd August 09:47
ford tech
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Posts: 1
Default 2001 Ranger --- Limited-slip rear end noise?


To answer your specific questions.. 1) NO, only if one wheel is slipping as previously stated.

NO, its an 8.8" rearend. Ford did not put the 9" in the ranger after 86 I
think it was. I have a 2000 with 8.8" 28spline axle. I am willing to bet
that is what you have. If you search "Ford F6 axle code" in google the first
page it lists has your axle code on it. The info is as follows: F6- Limited
Slip- 2700lb capacity- 3.73 gear ratio. The first letter denotes L/S or
open diff. and the # denotes your gear ratio. Mine is a 97 meaning: 3200lb
cap- open diff- 4.10 gears.


You can replace the OEM l/s for less than $400 with a Powertrax Traction
System. Its a gear type locker. I am installing one in my truck as I have an open diff.


If you have an L/S problem like CJB said, it will only eventually act as an
open diff, and not give you the lockup on both wheel.

I like the previous answers of it sounds like either the suspension is
moving and thats what you are hearing, or the driveshaft slip shaft is
binding and needs lubed. It is possible that it could be something in your
differential, possibly alot of backlash, is it more like a "bump" or
"grunt", or something else? Can you be a bit more discriptive about that
noise? That is VERY important, as that is your whole complaint. An
inaccurate description will cause an inaccurate diagnosis. Is it high
pitched, low pitched, how long exactly does it last (1sec, 3 sec?), stuff
like that.


Ford Tech
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