Positive Traction (POSI) Unit Tech Article Question - TCCoA Forums
 
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post #1 of 6 (permalink) Old 10-25-2009, 09:47 PM Thread Starter
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Positive Traction (POSI) Unit Tech Article Question

Guys,

The tech article says:

Quote:
"Posi" has become the generic term for a Limited Slip differential.
The "true posi" is a locker. Lockers positivly lock both sides together mechanically, giving complete torque to both sides when your heavy on the gas. Not a good way to go with our half shafts, you'll probably snap a few.
They have a habit of staying locked in turns untill you learn how to drive them right. And as we all know, the inside tire spins slower than the outside tire, and if they can't, things tend to break. You got to have a *VERY* carefull foot.
I have seen a few here with Limited Slip/POSI/Trac-Lock, but the tech article has a warning about it. Is this old news or good advice? With the prices on Ebay and others places, its not all that expensive to buy the parts. A guy on ebay sells reconditioned units with 28 splines for a good price. It would seem like a no-brainer to do this while you are having your gears replaced. Even new Ford units are inexpensive.

I want the best I can get, without going back into the rear end later on. At the same time, I want to stay within tolerances of the car since I still like to drive my car on the street.

Thanks!

-=James
1995 Ford Thunderbird V8
SCT Tuned by Amercian Motorsport, Mustang PBR, FRPP 3.73 gears, Modified Trak-Lok, Steeda UDP, K&N Panel, 1990 SC Seats, 2.5" Single Exhaust/Magnaflow Hi-Flow Cats, Michelin Pilot Sport A/S +, Windstar wheels, RichardM Intake, Kenwood KDC-HD552U HD Radio, 2800 stall DirtyDog Marauder TC, J-MOD, 2002 Grand Marquis transmission, DynoTech Driveshaft, AeroForce Interceptor Scan Gauge, Griffin Super High Capacity Radiator, 180* Thermostat, Cobra steering wheel, 6000K HID, Clear Corners Getting a makeover Spring 2015


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Last edited by CometGSR; 10-25-2009 at 10:22 PM.
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post #2 of 6 (permalink) Old 10-25-2009, 09:57 PM
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i think the warning is about the true posi not the limited slip, but i could be wrong.

can you post a link to this guy who sells the 28 spline trac lok irs?
post #3 of 6 (permalink) Old 10-25-2009, 09:59 PM Thread Starter
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I talked to the guy already, he says no problem with the IRS.

Quote:
The irs and the abs is no problem. I would reccomend a moderate 8 clutch setup for your application that way it has a tight setup with good street manors. This is what i did for my 94 thunderbird with 4.10 gears and it was a sweet setup. Let me know if you have any other questions. I hope you bid! Thanks! -Mike-

-=James
1995 Ford Thunderbird V8
SCT Tuned by Amercian Motorsport, Mustang PBR, FRPP 3.73 gears, Modified Trak-Lok, Steeda UDP, K&N Panel, 1990 SC Seats, 2.5" Single Exhaust/Magnaflow Hi-Flow Cats, Michelin Pilot Sport A/S +, Windstar wheels, RichardM Intake, Kenwood KDC-HD552U HD Radio, 2800 stall DirtyDog Marauder TC, J-MOD, 2002 Grand Marquis transmission, DynoTech Driveshaft, AeroForce Interceptor Scan Gauge, Griffin Super High Capacity Radiator, 180* Thermostat, Cobra steering wheel, 6000K HID, Clear Corners Getting a makeover Spring 2015


http://www.fordthunderbird.net - For Pics and more!

Last edited by CometGSR; 10-26-2009 at 01:49 PM.
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post #4 of 6 (permalink) Old 10-26-2009, 05:39 AM
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you want the limited slip diffy, it will let it "slip" mostly on turns so you dont bark the inside tire.

you may have to redo the clutch pack after 20,000mi or so depending on driving habits
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post #5 of 6 (permalink) Old 10-26-2009, 05:59 AM Thread Starter
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Thanks for the responses.

I did find out my answer for the Trac-Lock IRS. I guess there is a difference..
http://www.fordracingparts.com/parts...tKeyField=2352

Hopefully, I can work with the guy to fix me up with the correct part.

-=James
1995 Ford Thunderbird V8
SCT Tuned by Amercian Motorsport, Mustang PBR, FRPP 3.73 gears, Modified Trak-Lok, Steeda UDP, K&N Panel, 1990 SC Seats, 2.5" Single Exhaust/Magnaflow Hi-Flow Cats, Michelin Pilot Sport A/S +, Windstar wheels, RichardM Intake, Kenwood KDC-HD552U HD Radio, 2800 stall DirtyDog Marauder TC, J-MOD, 2002 Grand Marquis transmission, DynoTech Driveshaft, AeroForce Interceptor Scan Gauge, Griffin Super High Capacity Radiator, 180* Thermostat, Cobra steering wheel, 6000K HID, Clear Corners Getting a makeover Spring 2015


http://www.fordthunderbird.net - For Pics and more!
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post #6 of 6 (permalink) Old 10-26-2009, 01:49 PM Thread Starter
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Well, I think the guy bailed. So I am left with getting a new unit from SCP or buying a used one and having it rebuilt. How hard is it to refurbish these units? I know Jegs sells kits to service them.

-=James
1995 Ford Thunderbird V8
SCT Tuned by Amercian Motorsport, Mustang PBR, FRPP 3.73 gears, Modified Trak-Lok, Steeda UDP, K&N Panel, 1990 SC Seats, 2.5" Single Exhaust/Magnaflow Hi-Flow Cats, Michelin Pilot Sport A/S +, Windstar wheels, RichardM Intake, Kenwood KDC-HD552U HD Radio, 2800 stall DirtyDog Marauder TC, J-MOD, 2002 Grand Marquis transmission, DynoTech Driveshaft, AeroForce Interceptor Scan Gauge, Griffin Super High Capacity Radiator, 180* Thermostat, Cobra steering wheel, 6000K HID, Clear Corners Getting a makeover Spring 2015


http://www.fordthunderbird.net - For Pics and more!
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