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my tibrd is in the shop right now for some issues that are coverd by warranty, anyways, when i get it back i was thinking about buying the positrack rear end from a v8 cougar from a local junkyard and swapping out rear ends, i was wondering if anyones done this and what the results are like and stuff

thanks
 

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Check out the Drivetrain Forums. keep in mind "positrac" is a GM term, Trac-loc is the Ford term.. Trac-loc will yeild you more results when doing a search on it.
 

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Stinkfist04 said:
Check out the Drivetrain Forums. keep in mind "positrac" is a GM term, Trac-loc is the Ford term.. Trac-loc will yeild you more results when doing a search on it.
This is true. "Posi-trac" and "Trac-Loc" are both brand names for what is commonly called a "limited slip" rear end. Its misleading because neither is actually a "locked" rear end.

However to answer your question.

Yes, its been done many times. I myself have done it. Bear in mind that while you are searching the yards, that not all mn12's got the track-loc, V8 or not. The most accurate way to determine if the center section ("pumpkin") is a limited slip is to check out the metal tag that is held on by one of the bolts (usually near the top) that holds the rear cover on. If the code has an "L" in it, its a limited slip. for example "3L27" is a 3.27 Trac-Loc.

The easiest way is to is to check the rear end code from the tag glued in the drivers side door jamb. The codes are on this chart:

http://www.tccoa.com/articles/gears/gears.html

Other good tech articles to read:

http://www.tccoa.com/articles/gears/index.html#

Keep in mind that it is possible that someone could have changed rear ends before the car made it to the salvage yard so the door jamb, though easier, isn't as accurate as the tag on the rear end itself. When/if you find one, be sure it is low mileage, and even then you probably ought to have it rebuilt. The first one I installed lasted about a year before the clutches wore out and it acted like an open rear end. The second one I installed is still good. (it was much lower mileage when I installed it).

Results? Great, I love it. Car launches much better with it.
 

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i'm running 3.27 gears need better!!!!!!!!!!!!!
 

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I'm putting 3.55's in this spring.
 

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Stinkfist04 said:
Check out the Drivetrain Forums. keep in mind "positrac" is a GM term, Trac-loc is the Ford term.. Trac-loc will yeild you more results when doing a search on it.
Don't forget! Sure-Grip is the MoPar term!
 

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LOL Sure-Grip? Sounds like something to hold your dentures in! :D
 

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1995 Thunderbird LX 4.6 red
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Traveler said:
LOL Sure-Grip? Sounds like something to hold your dentures in! :D
"now that i use sure grip, i dont have to worry about eating apples and peanut brittle! And it leaves great tire tracks as well! I love my Sure grip"....available at Walmart and all dodge dealers..:tongue:
 

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95SilverLX said:
hey can i just use my stock rear end housing and install trac-loc and put in bigger gears like 3.73s.
Short answer is yes. BUT you've got a 7.5 under the V6. The 8.8 (from a V8) is more prevalent, easier to find parts for, and will hold up if you ever make any kind of real power.
 

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Actually, if you're really interested, I might know of a salvage yard that actually has a low mileage, 7.5 3.27 trac-loc center section for sale. I can check with them and see if they've still got it if you want.
 

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What are the HP limitations of the 7.5?
Iam looking at about 245hp and wondering how much further I can go before I am forced to change out the exhaust I JUST put in (limited to 275hp) and my rear end.
 
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