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post #1 of 34 (permalink) Old 12-07-2008, 03:43 PM Thread Starter
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Open diff to Trac Loc

How hard would it be and what parts are needed to make an open diff into a trac loc? Could I just get a rebuilt Trac Loc unit and swap it in or is there a lot more to it than that?
Thanks.
Scott

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post #2 of 34 (permalink) Old 12-07-2008, 08:11 PM
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Cheapest way is to get a mustang traction lock and machine the gears. Otherwise you need an SC traction lock. I do suggest new bearings while you have it apart. I generally charge $250 in labor to build one if that gives you an idea of what it takes. You will need some special tools to do it right.
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post #3 of 34 (permalink) Old 01-03-2009, 02:11 AM
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I have been searching and have not gotten a convincing answer on this: is it okay to just leave the circlip off of the axle, and not have the gears machined? I would think there would be no problem unless more is wrong. I read that driller said it was okay, but has there been any problems to anyone's knowledge?

Thanks,

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post #4 of 34 (permalink) Old 01-06-2009, 09:25 PM
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best bet is to go to a pull-a-part and just getting the whole rear diff from a sc

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post #5 of 34 (permalink) Old 01-07-2009, 05:55 PM
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I swapped out my open diff in my '95 to a unit from a S/C. Had the clutch pack redone, all new fluids, and a nice set of used 3:55 gears. Probably OK if you use 3:27, but the Trac-Lok is a significant upgrade.

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post #6 of 34 (permalink) Old 02-09-2009, 09:44 AM
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I just swapped my 7.5 with 3.27s and a TracLok to a 8.8 with 3.55s and a TrakLok. What a BIG difference. I only lost a touch of MPG, too.

But the main point is getting your hands on a SC Diff and getting it put together right.

Tydlwayz may have a few SC diffs available.

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post #7 of 34 (permalink) Old 02-09-2009, 09:55 AM
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Quote:
Originally Posted by 94mncougar View Post
I have been searching and have not gotten a convincing answer on this: is it okay to just leave the circlip off of the axle, and not have the gears machined? I would think there would be no problem unless more is wrong. I read that driller said it was okay, but has there been any problems to anyone's knowledge?

Thanks,

Stephen
thats how I run mine.....mustang diff, no clips.

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post #8 of 34 (permalink) Old 02-09-2009, 10:05 AM
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99 Cobra diff is a better option .

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mph .... 77.13

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post #9 of 34 (permalink) Old 02-09-2009, 12:52 PM
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99 Cobra diff is a better option .
Easily said,not easily done.
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post #10 of 34 (permalink) Old 02-09-2009, 01:15 PM
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There are many Thunderbird V8's out there with Trac-Lok as well; you don't have to limit yourself to finding a Supercoupe.
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post #11 of 34 (permalink) Old 02-09-2009, 01:24 PM
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Tinman, Did the V8s come with 8.8's or 7.5's? I forgot the language on the window sticker of my V6 bird, but I thought it had a 8.8. Was wrong. Just a 7.5 with a TracLok.

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post #12 of 34 (permalink) Old 02-09-2009, 01:48 PM
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V8's came with 8.8's. IIRC, there are some n/a V6's out there that have 8.8's from the factory but they are not common.
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post #13 of 34 (permalink) Old 02-09-2009, 02:30 PM
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Easily said,not easily done.
Alan
Is it that they are hard to find?

I got the best deal on ebay .
Got pretty much the whole IRS from a 99 cobra except for brakes ,springs and shocks for 350.00 sold everything but the frame and differential .

The Differential fits right in with my old half shafts , maybe I got lucky .

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60'...... 2.06
1/8th .. 9.194
mph .... 77.13

mods*
PI heads *PI intake*Mark VIII torque converter*Cobra T-loc w\4.10's * Jmod*tranny fluid cooler*P&P stock T/B & plenum*UD pulleys* Dynotech 4in ds*80mm Lightning maf*Xcal2*02 GT intake tube.
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post #14 of 34 (permalink) Old 02-09-2009, 02:35 PM
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There are many Thunderbird V8's out there with Trac-Lok as well; you don't have to limit yourself to finding a Supercoupe.
I'll second that. And cougars.
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post #15 of 34 (permalink) Old 02-09-2009, 06:47 PM
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Quote:
Originally Posted by cjchevez View Post
Is it that they are hard to find?

I got the best deal on ebay .
Got pretty much the whole IRS from a 99 cobra except for brakes ,springs and shocks for 350.00 sold everything but the frame and differential .

The Differential fits right in with my old half shafts , maybe I got lucky .
The issue is that they are one year only. Very hard to get your hands on. Any 28 spline traction lock carrier will work in the case as long as the side gears are machined for IRS axles. They are easily found.
Alan

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post #16 of 34 (permalink) Old 02-09-2009, 08:13 PM
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I read that driller said it was okay, but has there been any problems to anyone's knowledge?

Thanks,

Stephen
I've known several that have done this and have never heard of any issues whatsoever from doing this.
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post #17 of 34 (permalink) Old 02-17-2009, 09:10 AM
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There are many Thunderbird V8's out there with Trac-Lok as well; you don't have to limit yourself to finding a Supercoupe.
Quote:
Originally Posted by r429460 View Post
I'll second that. And cougars.
I see 3.8 non-SC in the yards here all the time. In fact the diff in my 95 SC right now is from a 3.8 3.27TL car. All I've seen have disc rears so that is a quick way to tell.
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post #18 of 34 (permalink) Old 02-17-2009, 09:41 AM
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I see 3.8 non-SC in the yards here all the time. In fact the diff in my 95 SC right now is from a 3.8 3.27TL car. All I've seen have disc rears so that is a quick way to tell.
Yes, but are they 8.8" rears in the 3.8s or like mine was, a 7.5" with 3.27s and a Trakloc?

My 7.5 didn't stand up to my N/A 3.8 with underdrives and a mildly JModded 4R70W. When I splitport the engine, I hate to think in how many pieces the 7.5 would be in.

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post #19 of 34 (permalink) Old 02-17-2009, 09:58 AM
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Yes, but are they 8.8" rears in the 3.8s or like mine was, a 7.5" with 3.27s and a Trakloc?

My 7.5 didn't stand up to my N/A 3.8 with underdrives and a mildly JModded 4R70W. When I splitport the engine, I hate to think in how many pieces the 7.5 would be in.
Yes 8.8 TL. I think the key is the disc brake rears.

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post #20 of 34 (permalink) Old 02-17-2009, 05:05 PM
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Yes 8.8 TL. I think the key is the disc brake rears.
my '97 3.8 w/ rear disc brakes has a 7.5"

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post #21 of 34 (permalink) Old 02-17-2009, 05:19 PM
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Yes 8.8 TL. I think the key is the disc brake rears.
My 97 had disk brake rears and a 7.5 TL from the factory.

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post #22 of 34 (permalink) Old 02-17-2009, 06:24 PM
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Ok ok I get it.

So obviously all the 8.8, 3.8's came to Texas.
Everything's bigger...
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post #23 of 34 (permalink) Old 02-17-2009, 07:33 PM
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Ok ok I get it.

So obviously all the 8.8, 3.8's came to Texas.
Everything's bigger...
Except women's breasts. Even Anna Nicole had to have implants.

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post #24 of 34 (permalink) Old 02-17-2009, 07:58 PM
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Except women's breasts. Even Anna Nicole had to have implants.
But they were bigger implants.
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post #25 of 34 (permalink) Old 02-17-2009, 09:47 PM
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But they were bigger implants.
Stop drooling, they were fakes. Wait until you get the real ones in your hands.

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post #26 of 34 (permalink) Old 02-17-2009, 11:20 PM
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just about every cougar or T-bird I have seen that had disk brakes in the rear came with a 8.8 diff whether it was a V6 or V8. in the yard I work in there are 3 cars with a E code (3.27 TL). One is a V8 with drum brakes the other 2 are V6's with disk brakes. all 3 have a 8.8 .

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post #27 of 34 (permalink) Old 02-17-2009, 11:49 PM
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just about every cougar or T-bird I have seen that had disk brakes in the rear came with a 8.8 diff whether it was a V6 or V8. in the yard I work in there are 3 cars with a E code (3.27 TL). One is a V8 with drum brakes the other 2 are V6's with disk brakes. all 3 have a 8.8 .
Clint, were they 97s? I think that might be the key here. On the 97 Ford was cheaping out every way they could. All my springs have failed, and one of the replacements too. I can't wait for other things to go south, so am upgrading as fast as I can.

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post #28 of 34 (permalink) Old 02-18-2009, 07:02 AM
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we only have one 97 and the rear was gone before I could check it.

I have a 89 and have had to replace all 4 springs due to failure.

I've come into this world with nothing and still manage to have some of it left.

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post #29 of 34 (permalink) Old 02-18-2009, 07:32 AM
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The big thing to remember is that if you put together the rear end without machining the gears, it is almost impossible to get the axles out.

Some people have said that leaving the circlip off makes this moot, but I wonder about the inner CV joint moving around... I know the axle can't come out, but this seems dangerous, somehow.

Wasn't it kdanner that posted about the 'difficulty' of removing the axles, with a bent toward violence?

Yeah, here it is...
http://forums.tccoa.com/showthread.php?t=108693

This is pretty good info...

YMMV.

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post #30 of 34 (permalink) Old 02-18-2009, 07:38 AM
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I don't daily drive mine, but the driving that it gets, I've never had a problem with my axles coming out.....

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