Whats wrong with my rear end? - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 10-10-2010, 08:58 AM Thread Starter
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Whats wrong with my rear end?

I changed the gear oil, added the friction modifier, when accelerating while turning at low speed, like pulling out of a drive way onto the road I get for lack of a better description I get a womp womp womp, and I can feel a vibration. Is the limited slip going out or is the whole rear end going? Its got 152,000 miles on it. Any help is greatly appreciated

2000 F-250 Reg. Cab Long Box, 4x4, Auto., 285/75/16 GY Dura Tracs,

1990 Mustang 5.0 LX hatchback, auto, Prowler orange. Car has full exhaust, E-cam, Trick Flow upper and lower intake, ADJ. fuel pressure reg, A/C delete, AOD with hardened shafts shift kit and TCI 3500 stall, not yet installed 3:73 gears, and TFS Twisted Wedge heads
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post #2 of 12 Old 10-10-2010, 01:14 PM
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u add motorcraft lsd add?
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post #3 of 12 Old 10-10-2010, 02:33 PM Thread Starter
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I used Valvoline synthetic gear oil, it said that you dont need to use an extra additive, so I ran it for a while and noticed the womp in the rearend so I went back to NAPA and picked up there friction modifier, put it in and it still does it

2000 F-250 Reg. Cab Long Box, 4x4, Auto., 285/75/16 GY Dura Tracs,

1990 Mustang 5.0 LX hatchback, auto, Prowler orange. Car has full exhaust, E-cam, Trick Flow upper and lower intake, ADJ. fuel pressure reg, A/C delete, AOD with hardened shafts shift kit and TCI 3500 stall, not yet installed 3:73 gears, and TFS Twisted Wedge heads
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post #4 of 12 Old 10-10-2010, 02:35 PM Thread Starter
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Ill go to Ford tomorrow and pick up there additive, should I drain and refill the diff or can I add the Ford stuff along with the stuff thats already in there?

2000 F-250 Reg. Cab Long Box, 4x4, Auto., 285/75/16 GY Dura Tracs,

1990 Mustang 5.0 LX hatchback, auto, Prowler orange. Car has full exhaust, E-cam, Trick Flow upper and lower intake, ADJ. fuel pressure reg, A/C delete, AOD with hardened shafts shift kit and TCI 3500 stall, not yet installed 3:73 gears, and TFS Twisted Wedge heads
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post #5 of 12 Old 10-11-2010, 07:48 AM
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I'd drain and refill with what FoMoCo recommends.

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post #6 of 12 Old 10-11-2010, 01:03 PM Thread Starter
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I put the Ford additive in it and it still does it. I hope I didnt wreck anything by not running it for about 2,000 miles with the NAPA additive

2000 F-250 Reg. Cab Long Box, 4x4, Auto., 285/75/16 GY Dura Tracs,

1990 Mustang 5.0 LX hatchback, auto, Prowler orange. Car has full exhaust, E-cam, Trick Flow upper and lower intake, ADJ. fuel pressure reg, A/C delete, AOD with hardened shafts shift kit and TCI 3500 stall, not yet installed 3:73 gears, and TFS Twisted Wedge heads
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post #7 of 12 Old 11-11-2010, 05:55 PM
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I have the same problem in an 01 with 159000 on it, Changed with valvoline syn, put additive in, same problem, Everything looked great when i pulled my diff. cover off...
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post #8 of 12 Old 11-11-2010, 06:04 PM
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Same here . Just did this a couple months ago . Added friction modifier to the valvoline and it still does it . I figure it trashed the clutches in the ls. pack .

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post #9 of 12 Old 11-11-2010, 06:15 PM
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Sounds like you guys did take out the clutches in your diff. I did this in an 88 Mustang. Same thing, It was fine until I changed the fluid.

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post #10 of 12 Old 11-12-2010, 05:32 PM
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man, i figured this was the problem, but didn't want to hear anyone agree with my thoughts! ha, whats the cost usually to replace the limited slip setups in these? I have put detroit lockers in my muscle cars that i know are reliable, but they cost me upwards of $750 just for the parts!
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