Scrubbing Limited Slip Differential
#1
10-05-1999, 10:36 AM
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Scrubbing Limited Slip Differential
I mentioned this on a previous topic, but I didn't think it was a problem till now. Two months ago I replaced my diff fluid after getting water inside from one of my offroad expeditions. I first got it checked from one of the ford mechanics, and he verified about an ounce to two ounces of water in the rear diff. After getting quoted $30/L for ford synthetic gear oil, and $250 for the full cost, he explained that the warranty wouldn't be voided if I were to do the job myself. Instead of using the $30/L ford oil, I bought some TORCO synthetic racing gear oil for $12/L, and a bottle of the ford friction modifier. Before the oil change, I had no scrubbing sound going around corners, but not the case after. I also added another bottle of the friction modifier and no difference. I have a feeling, for some reason, the TORCO oil doesn't provide the same slippage as the ford gear oil. By the way, the same weight of gear oil was used. What are the chances that maybe the fiber clutch plates got contaminated from the water. I left it over night, without any fluid, to let the silicone on the diff cover dry, so maybe letting it sit dried up the clutches somehow? I've been driving it over 2 months with the scrubbing. Does anybody have any ideas? I'm not really worried about getting it warrantied, it's just a little frustrating.
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'98 F-150 XLT Reg. Cab Flareside 4x4, Black, 5.4l, 3.55LS, tow package, K&N, GTS headlight covers, Alpine changer w/FM mod, Clifford alarm system w/keyless entry & starter disable // Future considerations: 285/75/r16 Mud Terrain BFG's, bed mat, tonneau cover, 4" suspension lift.
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'98 F-150 XLT Reg. Cab Flareside 4x4, Black, 5.4l, 3.55LS, tow package, K&N, GTS headlight covers, Alpine changer w/FM mod, Clifford alarm system w/keyless entry & starter disable // Future considerations: 285/75/r16 Mud Terrain BFG's, bed mat, tonneau cover, 4" suspension lift.
#2
10-05-1999, 11:47 AM
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Fordification...
I have changed the rear end oil on lots of posi units, both G.M. and Fords. I've always did like you and used the recommended friction modifier from the manufacturer and have never had a problem. As a matter of fact, my wife's Z-28 didn't use synthetic oil but a multi-weight hypoid oil. I replaced it with "Sta-Lube" multi-weight and G.M. friction modifier. My previous 93 Ford Lightning used synthetic and I coughed up the big bucks to buy it from Ford (dealer had to order it) and used Ford friction modifier all with no problems. I doubt if your clutches could dry out; they're dry when first installed at the factory but after they get fluid in them they shouldn't dry out again. Pour some of your rear end oil in a pan and you'll be 90 years old before it evaporates. I wish I could tell you something more definitive. If it were me, I would try the job over again using the Ford stuff. If it then still makes the noise, have Ford fix it under warranty.
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2000 F-150 4X2 XLT Ext Cab Flareside (Black w/dark graphite) Sport Package, 5.4L, Auto, 3.55 Limited Slip, Keyless Entry, Tow Package, Pwr Seat.
1999 Eddie Bauer Explorer 4X2, Tropic Green/Tan... Every Option.
1997 Harley Davidson, Springer Heritage...Lots of goodies.
[This message has been edited by SPORT2000 (edited 10-05-1999).]
[This message has been edited by SPORT2000 (edited 10-05-1999).]
I have changed the rear end oil on lots of posi units, both G.M. and Fords. I've always did like you and used the recommended friction modifier from the manufacturer and have never had a problem. As a matter of fact, my wife's Z-28 didn't use synthetic oil but a multi-weight hypoid oil. I replaced it with "Sta-Lube" multi-weight and G.M. friction modifier. My previous 93 Ford Lightning used synthetic and I coughed up the big bucks to buy it from Ford (dealer had to order it) and used Ford friction modifier all with no problems. I doubt if your clutches could dry out; they're dry when first installed at the factory but after they get fluid in them they shouldn't dry out again. Pour some of your rear end oil in a pan and you'll be 90 years old before it evaporates. I wish I could tell you something more definitive. If it were me, I would try the job over again using the Ford stuff. If it then still makes the noise, have Ford fix it under warranty.
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2000 F-150 4X2 XLT Ext Cab Flareside (Black w/dark graphite) Sport Package, 5.4L, Auto, 3.55 Limited Slip, Keyless Entry, Tow Package, Pwr Seat.
1999 Eddie Bauer Explorer 4X2, Tropic Green/Tan... Every Option.
1997 Harley Davidson, Springer Heritage...Lots of goodies.
[This message has been edited by SPORT2000 (edited 10-05-1999).]
[This message has been edited by SPORT2000 (edited 10-05-1999).]
#3
10-05-1999, 02:15 PM
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What I was thinking was that the little water that was in the diff had mixed in with the oil (temporarily, until it settles), and then the oil/water mix gets into the clutch pack and covers the fiber clutches. By letting it sit over night, could the water on the fiber plates dry up and somehow damage or alter the surface area of the plates? It seems very unlikely, considering the plates would have a protective coating of gear oil, but I'm trying to analyze the situation.
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'98 F-150 XLT Reg. Cab Flareside 4x4, Black, 5.4l, 3.55LS, tow package, K&N, GTS headlight covers, Alpine changer w/FM mod, Clifford alarm system w/keyless entry & starter disable // Future considerations: 285/75/r16 Mud Terrain BFG's, bed mat, tonneau cover, 4" suspension lift.
[This message has been edited by fordification (edited 10-05-1999).]
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'98 F-150 XLT Reg. Cab Flareside 4x4, Black, 5.4l, 3.55LS, tow package, K&N, GTS headlight covers, Alpine changer w/FM mod, Clifford alarm system w/keyless entry & starter disable // Future considerations: 285/75/r16 Mud Terrain BFG's, bed mat, tonneau cover, 4" suspension lift.
[This message has been edited by fordification (edited 10-05-1999).]
#4
10-05-1999, 03:05 PM
fordification,
It sounds like you have dirt/contamination from the water in the clutch pack. Even if you would have used OEM oil it still would have been there. You have to clean the assy to remove the dirt/contamination. Let the Dealer have a go at it.
Regards
Jean Marc Chartier
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On Order: 00 F-150 XLT SC Flairside 4x4 4.6 w/5spd
using: Wife'S 99 Explorer till arrival
It sounds like you have dirt/contamination from the water in the clutch pack. Even if you would have used OEM oil it still would have been there. You have to clean the assy to remove the dirt/contamination. Let the Dealer have a go at it.
Regards
Jean Marc Chartier
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On Order: 00 F-150 XLT SC Flairside 4x4 4.6 w/5spd
using: Wife'S 99 Explorer till arrival