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post #1 of 14 (permalink) Old 01-09-2007, 07:13 AM Thread Starter
 
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positrack rear end

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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post #2 of 14 (permalink) Old 01-09-2007, 09:46 AM
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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.

Justin McC
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post #3 of 14 (permalink) Old 01-09-2007, 01:41 PM
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Quote:
Originally Posted by Stinkfist04
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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Last edited by Traveler; 01-09-2007 at 01:51 PM.
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post #4 of 14 (permalink) Old 01-09-2007, 09:01 PM Thread Starter
 
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thanks guys if i need any help or suggestions ill contact u guys
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post #5 of 14 (permalink) Old 01-10-2007, 02:25 PM
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i'm running 3.27 gears need better!!!!!!!!!!!!!

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post #6 of 14 (permalink) Old 01-10-2007, 02:27 PM
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I'm putting 3.55's in this spring.


1997 Thunderbird Sport
Low Miles
Wifes Car
destined to remain stock

1997 T-Bird GT 4.6
80 MM Mustang GT MAF - P&P'd Mustang GT TB and Intake Plenum - PI Intake manifold - PI Heads
Mark VIII Torque Converter - J-Modded 4R70W transmission - Mark VIII Aluminum Driveshaft - 3.73 gears
PBR Brake Calipers - Eibach Springs - KYB Shocks
'89 SuperCoupe front and rear sway bars
SCT Chip programmed by Lonnie Doll
255/50/16 Falken Ziex ZE-512's
True Dual exhaust with Magnaflow DI/DO muffler
<<< SOLD >>>
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post #7 of 14 (permalink) Old 01-10-2007, 06:21 PM
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Quote:
Originally Posted by Stinkfist04
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!

http://images19.fotki.com/v358/photo...Tbird01-vi.jpg
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post #8 of 14 (permalink) Old 01-10-2007, 07:01 PM
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LOL Sure-Grip? Sounds like something to hold your dentures in!


1997 Thunderbird Sport
Low Miles
Wifes Car
destined to remain stock

1997 T-Bird GT 4.6
80 MM Mustang GT MAF - P&P'd Mustang GT TB and Intake Plenum - PI Intake manifold - PI Heads
Mark VIII Torque Converter - J-Modded 4R70W transmission - Mark VIII Aluminum Driveshaft - 3.73 gears
PBR Brake Calipers - Eibach Springs - KYB Shocks
'89 SuperCoupe front and rear sway bars
SCT Chip programmed by Lonnie Doll
255/50/16 Falken Ziex ZE-512's
True Dual exhaust with Magnaflow DI/DO muffler
<<< SOLD >>>
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post #9 of 14 (permalink) Old 01-10-2007, 07:44 PM
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Quote:
Originally Posted by Traveler
LOL Sure-Grip? Sounds like something to hold your dentures in!
"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..

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post #10 of 14 (permalink) Old 01-11-2007, 11:53 AM Thread Starter
 
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hey can i just use my stock rear end housing and install trac-loc and put in bigger gears like 3.73s.
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post #11 of 14 (permalink) Old 01-11-2007, 12:26 PM
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Quote:
Originally Posted by 95SilverLX
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.

Sometimes, we just need to remember what the rules of life really are:
You only need two tools: WD-40 and Duct Tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #12 of 14 (permalink) Old 01-11-2007, 12:41 PM
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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.


1997 Thunderbird Sport
Low Miles
Wifes Car
destined to remain stock

1997 T-Bird GT 4.6
80 MM Mustang GT MAF - P&P'd Mustang GT TB and Intake Plenum - PI Intake manifold - PI Heads
Mark VIII Torque Converter - J-Modded 4R70W transmission - Mark VIII Aluminum Driveshaft - 3.73 gears
PBR Brake Calipers - Eibach Springs - KYB Shocks
'89 SuperCoupe front and rear sway bars
SCT Chip programmed by Lonnie Doll
255/50/16 Falken Ziex ZE-512's
True Dual exhaust with Magnaflow DI/DO muffler
<<< SOLD >>>
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post #13 of 14 (permalink) Old 02-23-2007, 07:43 PM
 
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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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post #14 of 14 (permalink) Old 02-23-2007, 07:54 PM
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the 7.5 is a grenade-o-matic.




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