Locking rear differential

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Mar 7, 2004 | 05:42 PM

Stroker01

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Joined: Mar 2004

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From: Central PA

Locking rear differential

I have a 2001 F250 PSD 2x4. How can I tell without raising the truck wether or not I have a traction locking rear diff.? I thought It was locking untill I got stuck. The left side spun but right would not lock in to privide more traction. Any help or advise is appreciated. Not sure if there is a malfunction or its not a locker.

Last edited by Stroker01; Mar 7, 2004 at 06:03 PM.

Mar 7, 2004 | 05:52 PM

87MarkVIILSC

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Joined: Feb 2004

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From: Juniata County, PA

put in to 1st gear, stand on brakes and smash the gas. if its a locker she'll blow posi

Mar 7, 2004 | 06:15 PM

99f350sd

Lead Driver

Joined: May 2003

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From: Lyndonville, Vermont

They don't work in snow or ice too often just on pavement usually.. Jack up the rear and spin a wheel the other should spin the same direction...if its posi

Mar 7, 2004 | 07:10 PM

78fordman

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Joined: Oct 2003

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From: Jefferson, Iowa

I am assuming you mean if it has factory limited slip. Look on the tag on the rear differential, and as you are looking at it, on the second line there will be some numbers. like 3 73 or 3ls 73, or something simular. It is a axle ratio, so it will be either 3 73 or 4 10, if there is another letter in there it is a limited slip rear end from the factory. Otherwise jack up the rear end, and see if both tires spin when you turn one. In an open diff, the oposing wheel will spin in oposite direction. If it spins the same you have a locker (hopefully not made by lincoln LOL).

Mar 7, 2004 | 07:11 PM

cwb

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NO, if it's an l/s the tires will still spin in opposite directions.Only with lockers do they spin in the same direction.You don't have a locker but you may have a limited slip. Post your Vin and someone can look it up for you or look at the tag on the cover of the diff and post those numbers.Ford limited slip's(Dana Trac-locs)are notorious for not working very well.

Last edited by cwb; Mar 7, 2004 at 07:24 PM.

Mar 7, 2004 | 07:15 PM

DCSpecial

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Joined: Dec 2002

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From: IL, USA

If you want to know if you have a limited slip or not look at the AXLE code on the sticker that's on the door jamb and then look at the axle code list that's in the FAQ thread......they are all listed there.

Hope this helps.

Mar 7, 2004 | 07:15 PM

turbotom

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Joined: Mar 2002

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From: Northern Michigan

I am not impressed with the limited slip that came on my truck. My paved drive has an incline and with a fresh snow only one tire spins. I have to put it in 4 WD to get out the drive.
My brother's 01 CC 4X4 is the same way.

I did not order limited slip on my new truck, don't figure it is worth it.