Limited Slip Axle Question - Help please!
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New User
Joined: May 2003
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From: Asheville, NC
Limited Slip Axle Question - Help please!
I am a new poster, although not new to forum. Have been checking out the threads for a couple of weeks. Seems like a lot of knowledgeable and helpful people here. I look forward to joining your community.
Here's my question(s). Am seriously considering purchasing new 2003 6.0 PSD Excursion 4x4. The Limited model that I want is now on the lot with the options I want, but the vehicle has the regular 3.73 axle instead of the 3.73 limited slip axle (a $250 option).
1) What is the difference?
2) Which is better? I don't tow now, but will likely be towing in the 7000-8000 lb range with this vehicle in the forseeable future on a every other weekend basis.
3) What should I buy? Considering not only my current and future needs, but potential future sale of the vehicle.
Not relevant, but I currently drive a 1998 Expedition Eddie Bauer 4x4.
Here's my question(s). Am seriously considering purchasing new 2003 6.0 PSD Excursion 4x4. The Limited model that I want is now on the lot with the options I want, but the vehicle has the regular 3.73 axle instead of the 3.73 limited slip axle (a $250 option).
1) What is the difference?
2) Which is better? I don't tow now, but will likely be towing in the 7000-8000 lb range with this vehicle in the forseeable future on a every other weekend basis.
3) What should I buy? Considering not only my current and future needs, but potential future sale of the vehicle.
Not relevant, but I currently drive a 1998 Expedition Eddie Bauer 4x4.
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
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From: Washington State
Limited Slip Axle Question - Help please!
Originally posted by TarheelNorseman
... but the vehicle has the regular 3.73 axle instead of the 3.73 limited slip axle (a $250 option).
1) What is the difference?
2) Which is better? I don't tow now, but will likely be towing in the 7000-8000 lb range with this vehicle in the forseeable future on a every other weekend basis.
3) What should I buy? Considering not only my current and future needs, but potential future sale of the vehicle.
... but the vehicle has the regular 3.73 axle instead of the 3.73 limited slip axle (a $250 option).
1) What is the difference?
2) Which is better? I don't tow now, but will likely be towing in the 7000-8000 lb range with this vehicle in the forseeable future on a every other weekend basis.
3) What should I buy? Considering not only my current and future needs, but potential future sale of the vehicle.
1. A Limited Slip or LS unit will split the torque evenly between the two rea drive wheels.
2 & 3. For just towing and no offroading and no real inclement weather to contend with, then go for the truck on the lot. The 4WD will help you enough with any low traction situation. If it were a 2WD though, my advice would be opposite.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,730
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From: SE Florida
Limited Slip Axle Question - Help please!
Originally posted by Monsta
Welcome!
1. A Limited Slip or LS unit will split the torque evenly between the two rea drive wheels.
Welcome!
1. A Limited Slip or LS unit will split the torque evenly between the two rea drive wheels.
A limited slip differential limits the difference in speed between the two rear wheels. If both wheels are on a high traction surface and neither is slipping the limited slip does nothing at all. The torque is split between the two wheels regardless if you have the standard axle or the limited slip.
If one wheel starts to spin the limited slip clutch engages and limits how much the spinning tire can spin by transferring torque to the wheel that isn't spinning.
Posting Guru
Joined: Feb 2003
Posts: 2,153
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From: Roseburg OR.
Limited Slip Axle Question - Help please!
A limited slip differential limits the difference in speed between the two rear wheels. If both wheels are on a high traction surface and neither is slipping the limited slip does nothing at all. The torque is split between the two wheels regardless if you have the standard axle or the limited slip.
If one wheel starts to spin the limited slip clutch engages and limits how much the spinning tire can spin by transferring torque to the wheel that isn't spinning.
If one wheel starts to spin the limited slip clutch engages and limits how much the spinning tire can spin by transferring torque to the wheel that isn't spinning.
If one tire spins out the other tire will have only the friction of the clutch trying to drive that tire. The spinning tire doesn't make anything "engage."
The LS also does not limit the difference in speed between the two rear tires. That sounds more like a description of what a locker does although not an accurate one.
Elder User
Joined: Feb 2003
Posts: 648
Likes: 1
Limited Slip Axle Question - Help please!
If it's not exactly what you want, you might consider ordering one. You won't pay any more for it, and most of the time, you can negotiate a lower price on an ordered vehicle.
Maybe not on the 6.0L though. They're not even offering the incentives on those.
It's hard to wait, but you would get what you want.
Maybe not on the 6.0L though. They're not even offering the incentives on those.
It's hard to wait, but you would get what you want.
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