rearend jumping - Ford Powerstroke Diesel Forum
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Old 08-08-2013, 11:02 AM
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Question rearend jumping

I have a 99 F-350 DRW 2 wheel drive that seems to have a jumping feeling when I back up. I have a 4:10 limited slip and was wondering if the clutches in the rearend is causing this. And what would be the fix for this?
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Old 08-08-2013, 11:55 AM
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How many miles?

Have you checked the fluid lately? Not positive for our rear ends but most limited slip applications take a special additive to work "properly".

Id check your fluid, drain it and see if you have any metal shavings also. Could have lost a tooth which is only binding in reverse.....
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Old 08-08-2013, 12:25 PM
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Only in reverse? My linkage was loose when I bought my truck, but that made the rear end shift when starting in drive or reverse.
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Old 08-08-2013, 03:54 PM
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I checked the Oil level and it was down a little, I topped it off with the correct fluid but it seems to be getting worse. And I only notice it in reverse. Thanks for the reply's
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Old 08-08-2013, 03:55 PM
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I've been feeling this for about 6 months, but it's more noticeable now.
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Old 08-09-2013, 06:37 AM
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Its unfortunate but the only way you will probably find out is to pull the diff cover and see whats goin on in there. Too many things that could go wrong in there to just take a guess at sumthin you cant even see. At least its not a drop out third, then you would have to pull the axles.
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Old 08-09-2013, 11:52 AM
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Not exactly sure on the dually axle, but are your e brakes inside the rotor like the SRW. It could be you ebrake shoes??

Sent from AutoGuide.com Free App
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Old 08-11-2013, 02:33 PM
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I removed the cover and drained all the old oil out, went to the dealer and picked up a bottle of friction modifier and 5 qts of the recommended oil. I rolled the tires while looking inside but I didn't see anything , No metal shavings so I closed everything back up and add the friction modifier and the oil and have since drove it around 70miles and everything sounds good now, maybe just needed fresh oil, don't know, Thanks for all your help,
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