Posi vs. limited slip? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 01-04-2006
Fazda's Avatar
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Posi vs. limited slip?

Okay I've tried searching but haven't found the info I'm looking for. What are the differences between posi and limited slip. I understand posi is full time but how does limited slip work and what are the pro's and cons of the two. It would be going in a daily driver not a trail rig. I have a 7.5 with 4.10 gearing now and thinking about a 8.8, but unsure if it's worth it.
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Old 01-04-2006
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posi-rear - if spider gear is welded both wheels always turn at the same speed
LS - uses a system of clutches to let one wheel rotate slower around turns but approaches locking of both wheels if slip occurs
Torsen - uses a system of gears to approach the locking of boths shafts if slipping occurs - does not wear out like a regular LS
locker - can lock both rear shafts - might cause uneven wear of rear tires and possible loss of traction if it locks up in turns with limited traction of both tires

best of both worlds is a switchable locker
acts as a LS unless locked via an in cab switch
switching action is via a pressurized tube or electro magnetic solenoid in the rear end
search under ARB, Auburn or Eaton for these types
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Old 01-04-2006
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Thanks this clears thing up alot. Will look into this a little futher before I decide.
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Old 01-04-2006
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Posi and LS are the same thing, different name. Like Trac Loc, posi trac, etc all the same thing, just different names the makers call it.
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Old 01-04-2006
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So would something like this work or do I need something newer for the abs?
http://cgi.ebay.com/ebaymotors/FORD-...QQcmdZViewItem
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Old 01-04-2006
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Posi = Positraction which was a GM trade name for a limited slip much like Ford uses trac-lok
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Old 01-05-2006
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only the Auburn ected (selectable) is a L/S when its not locked. detroit e-locker is an open diff when unlocked.


i myself 1 of these days am goin to get the Auburn to replace my no-slip. the no-slip is a good choice tho.. im just rdy to upgrade to better toys
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Old 01-05-2006
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For a daily driver with some trail use... The Detroit TruTrac torque sensing gear operated limited slip does a fine job on asphault and dirt.... Much better than the factory Trash Loc... No clutches to wear out and no need for friction modifier.
I used one in my Jeep for quite a few years... With the proper driving technique; you will have no problems having it engage (lock up) on the trail.

OR 4x4
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Old 01-05-2006
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Quote:
Originally Posted by Fazda
So would something like this work or do I need something newer for the abs?
http://cgi.ebay.com/ebaymotors/FORD-...QQcmdZViewItem
That one will work with your ABS because it has the tone ring installed. You can transfer your tone ring but it is a PITA. I would try to find a diff that didn't include the ring and pinion but has the tone ring already installed. I put a LS in my truck and swapping the tone ring was the hardest part of the job.
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Old 01-05-2006
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Tex,

Three months ago I removed the factory open carrier and installed a Detroit TruTrac in the 8.8. Removal of the carrier bearings off the factory carrier was the most time consuming...
Not sure what problems you had removing the tone ring....The only problem I can think of was breaking the surface tension of the oil between the carrier and the tone ring and that was solved by warming up the surface with a MAP torch.

OR 4x4
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Old 01-05-2006
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I bought new bearings and had them pressed on by the machinist where I work - so that was easiest part for me
I broke the damn tone ring trying to get it off, heated the damn thing up with a torch too. It was REALLY pressed on!
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Old 01-05-2006
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Tex,

Guess the inside of tone ring to the outside of the carrier was MORE than just an interference fit on yours.
Did you notice any burrs or marks where the two were galled upon assembly???
We heated the tone ring with the torch and smacked the ring with a brass hammer.... It moved almost immediately and then we worked the full circumference of the ring until it dropped off...
Prior to installation onto the new carrier.... we took scotch brite and cleaned both surfaces then applied some synthetic grease to both prior to reassembly.

OR 4x4
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