2001 f250 psd rear end problem - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 02-18-2010, 05:00 PM   #1 (permalink)
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2001 f250 psd rear end problem

Not sure what the problem is but here are the symptoms. When you give it alittle gas it feels like the rear end has same play in it .I took it somewhere for some unrelated issues and they took a look at it and said the problem may be in the rear . He could see the drive shaft spin maybe a little less than 1/2 revolution before it would engage the wheels . It does not appear to make any noises when I drive just when you start to take off you can feel the slake ..

ANT IDEAS
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Old 02-18-2010, 09:06 PM   #2 (permalink)
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I think I'd steel myself and take the rear cover off. Probably be ready to catch chunks of steel in the drain pan.

At least after that you'd have a much better idea what was wrong. If everything looked good inside the axle, then you could button it back up, fill with fresh gear oil, and be happy about it.
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Old 02-19-2010, 05:32 PM   #3 (permalink)
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Do you have a Limited Slip??? I recently experienced some problems with Drive Train and it turned out to be a fluid problem in the rear end.

Ford recommends 4oz of Abrasive Additive but I've been told by a buddy to put in 8oz. Fixed my problem.

If not a Limited Slip, never mind...........
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Old 02-19-2010, 08:24 PM   #4 (permalink)
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What the above posters said.

But I might also put the truck in neutral and see for myself how much "free" rotation the DS has. In my experience it should be about 10-20 degrees.

If it is more, I would say that you have a problem with your pinion bearings.

I had a similar problem with the ranch truck I got and the driveshaft slipjoint was rusted solid. This put a lot of pressure on the pinion when the truck was loaded down and the pinion could move in and out (after I removed the DS) and also side to side. Showed similar symptoms to what you are seeing. This was a pretty bad neglected case, maybe yours is a bit less severe.

Keep us posted.
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Old 02-19-2010, 09:05 PM   #5 (permalink)
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Was it costly to repair it ??
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Old 02-19-2010, 09:15 PM   #6 (permalink)
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$400 for a used rear end - ended up doing it a couple of times - but I can swap a rear end in about an hour!!
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Old 02-19-2010, 09:35 PM   #7 (permalink)
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So you changed the whole axle ?? Or just the internal parts
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Old 02-19-2010, 09:47 PM   #8 (permalink)
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Yes - cheaper knowing the amount of damage there was - had chipped teeth so new ring and pinion for $250 then bearings and labor would have been pricey. It had some problems - gotta catch these things fast like you have done.
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Old 02-19-2010, 09:50 PM   #9 (permalink)
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So I guess I should not really be driving it until I repair or it may do a lot more damage .
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Old 02-19-2010, 11:08 PM   #10 (permalink)
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I have first hand knowledge on the cost of rear end repair. I had three teeth chipped on the ring gear as well as some burs on some of the teeth. It was $2000 for a ring and pinion, bearings , seals and labor to repair. I decided since I was going that far I would get a real rear end. I also had them install a Detroit Locker for another $500 in parts. But I am a happy camper now.
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Old 03-02-2010, 07:01 PM   #11 (permalink)
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Update

Took my truck to two different shops . The first shop said it looks like you need to replace your gears in the rear .. $920 . I did not like there answer or confidence so I took it to a different shop. The second shop had it and after about one hour they told me it was the drive shaft slip joint where the two drive shafts come together . They pulled it apart and it had what looked like plenty of grease so they put some more in it . Put everything back together and now the noise and the bump is all gone . Total repair $56 ..
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Old 03-02-2010, 10:51 PM   #12 (permalink)
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Ah, the old 'grease up the slip shaft' trick! that used to be suggested quite a bit here, times have changed. Glad you got the problem fixed. Some guys have drilled and installed zerk fittings in their slip shaft so they can keep it lubed up without having to remove it again.
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