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post #1 of 19 (permalink) Old 09-05-2016, 07:42 PM Thread Starter
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Mind Blown.

So I always had the impression that 94-95 Tbirds only had 3.08 rear gears. I was under that impression because the 96-97 cars had 3.27s, and In a TCCOA tech article comparo (see this) states something along those lines. Well my local pull it junky yard had a 40% off weekend so I went out yesterday and picked this up. See pictures below.

As you can see this is a 95 Thunderbird clearly rocking an OEM 3.27 traction lock. What gives? I am happy all the same I picked this up for something close to 40$

Axle Codes
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1995 Ford Thunderbird 4.6 LX - SC wheels, enlarged rear sway bar, full sound system, cut mufflers, PST 1 1/8" rear bar, Eibachs, Mark 8 LCA's, Al housed 3.55 gearset, cut mufflers
2011 BMX X5 Xdrive50i - BMS Stage 1, Cut Muffler
2005 Jeep Grand Cherokee 5.7L-Her stock DD
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post #2 of 19 (permalink) Old 09-05-2016, 07:52 PM
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It was optional for 94/95.

Pearl 97 LX Sport - Purchased Feb. 09 - 5x4.5 Bolt patern, Cobra Brakes, Voghtland spings, Silver FR500's, 3.73's, MMX drive shaft...more to come
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post #3 of 19 (permalink) Old 09-05-2016, 08:46 PM
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My 1995 has 3.27's, but no traction lock.

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post #4 of 19 (permalink) Old 09-05-2016, 08:50 PM Thread Starter
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I never knew. My 94 had 3.08s and my current 95 has 3.08s. I was under the impression they all had 3.08s. So you could choose between 3.08 and 3.27s for the 94-95 year? then 96-97 went to just 3.27s?

1995 Ford Thunderbird 4.6 LX - SC wheels, enlarged rear sway bar, full sound system, cut mufflers, PST 1 1/8" rear bar, Eibachs, Mark 8 LCA's, Al housed 3.55 gearset, cut mufflers
2011 BMX X5 Xdrive50i - BMS Stage 1, Cut Muffler
2005 Jeep Grand Cherokee 5.7L-Her stock DD
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post #5 of 19 (permalink) Old 09-05-2016, 09:57 PM
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Quote:
Originally Posted by JoeyICU View Post
I never knew. My 94 had 3.08s and my current 95 has 3.08s. I was under the impression they all had 3.08s. So you could choose between 3.08 and 3.27s for the 94-95 year? then 96-97 went to just 3.27s?
Yup, TL was still optional in 96/7, but the only gear available was the 3.27.

97 Thunderbird LX (The GT Bird)
2003 Explorer WAP block with Modular Head Shop "street ported" heads and Stage 2 PI NA cams, 75mm Accufab throttle body, C&L upper intake plenum, Kooks 1.75" primary/3" collector headers, 2.5" full exhaust with mid mount Magnaflow dual in/out muffler, 24lb/hr injectors, 80mm MAF, Tuning from Don @ www.lasotaracing.com, CAI that feeds from fenderwell. Jmod, 3.73:1 TL in Mark VIII carrier, Mark VIII aluminum LCAs, 93 Mark VIII driveshaft, PBR brakes (soon to be Cobras), 18x9 wheels with 35mm offset, 255/40/ZR18 Tires, Front and Rear strut/shock bracing, GR-2 shocks, Eibach 1.5" springs, 1989 SC front and rear sway bars.
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post #6 of 19 (permalink) Old 09-05-2016, 10:53 PM
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Great score. Can't beat that for $40
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Mods? Yea, I got mods ...
Air silencer delete, warp drive, dilithium crystals, flux capacitor, Slingshot Rubber band power adder, Moonshine & Gas, Leaf Blower Supercharger, Hamster Wheel & Hamster, Energizer Bunny generating 1.21 gigawatts, Mr. FusionŽ Home Energy Reactor, hover conversion and a sextant celestial navigation system (The original GPS)
Best 1/4: 1,320 nanoseconds @ 670,616,629.2 miles per hour

"There isn't that much difference anymore between spacecraft, aircraft and modern automobiles..." - Keith Henry, NASA's Langley Research Center
See a list of my real mods and pictures of my car HERE. The true performance of my car was made possible by the Carolinas Crew Chief, RobertP at Rob's Tire & Auto
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post #7 of 19 (permalink) Old 03-11-2018, 10:01 AM
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Quote:
Originally Posted by Woodman View Post
Quote:
Originally Posted by JoeyICU View Post
I never knew. My 94 had 3.08s and my current 95 has 3.08s. I was under the impression they all had 3.08s. So you could choose between 3.08 and 3.27s for the 94-95 year? then 96-97 went to just 3.27s?
Yup, TL was still optional in 96/7, but the only gear available was the 3.27.
Traction lock on a 97 "stupid question but

--> would it show some kind of switch for it on dash or would it just exist without knowing you have it .. how's this defined by " sport" "Non sport "? Wondering if I have it.

If u run 373s over 327s every one saying that's truly a good starter upgrade to pep up the torque even before motor mods.
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post #8 of 19 (permalink) Old 03-11-2018, 10:56 AM
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Trac-lok is Ford's name for a limited slip differential. What you're referring to is traction control, that can be turned off with a button.

You can check if you have Trac-lok by looking for axle code E or XE, or just doing a burnout and see if both wheels spin.

Going from 3.27 to 3.73 is a proven performance mod, but you definitely will want Trac-lok if you don't already have it. Keep in mind, the Ford unit is obsolete, so used is your next best option, then rebuild the clutches. You can search Ebay for M-4204-F288, and maybe find a new old stock unit. But make sure it's for an IRS diff, there's a difference.

Also with 3.73's, expect a major hit in hwy gas mileage, like a solid 2-3 MPG drop.

Al

97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
Previous Fords:
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
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post #9 of 19 (permalink) Old 03-11-2018, 12:24 PM
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But 3.73's are so much fun!

I ran 4.10's on my car for about two years. I just recently switched back to 3.73's, the 4.10's are just too much gear for the highway. Great for the track, lousy for the highway.
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Mods? Yea, I got mods ...
Air silencer delete, warp drive, dilithium crystals, flux capacitor, Slingshot Rubber band power adder, Moonshine & Gas, Leaf Blower Supercharger, Hamster Wheel & Hamster, Energizer Bunny generating 1.21 gigawatts, Mr. FusionŽ Home Energy Reactor, hover conversion and a sextant celestial navigation system (The original GPS)
Best 1/4: 1,320 nanoseconds @ 670,616,629.2 miles per hour

"There isn't that much difference anymore between spacecraft, aircraft and modern automobiles..." - Keith Henry, NASA's Langley Research Center
See a list of my real mods and pictures of my car HERE. The true performance of my car was made possible by the Carolinas Crew Chief, RobertP at Rob's Tire & Auto
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post #10 of 19 (permalink) Old 03-11-2018, 12:37 PM
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Quote:
Originally Posted by 1991 5.0 View Post
Traction lock on a 97 "stupid question but

--> would it show some kind of switch for it on dash or would it just exist without knowing you have it .. how's this defined by " sport" "Non sport "? Wondering if I have it.

If u run 373s over 327s every one saying that's truly a good starter upgrade to pep up the torque even before motor mods.
There would be a button, usually on a panel occupying the "cubby" under the stereo, or possibly near the defrost switch. I don't recall.

The car would also have ABS, as it uses the ABS to brake the wheel that is spinning as stage one, then it starts pulling fuel.

If you don't have a button, you either don't have it, or a previous owner pulled the switch for some reason.
If you don't have ABS, you don't have it, period. Could have a TL rear end, but that is not traction control in the electronic sense. Personally, not a big fan of first gen traction control. It's not "smart" enough, and makes things like rocking the car out of snow a pain in the butt.

97 Thunderbird LX (The GT Bird)
2003 Explorer WAP block with Modular Head Shop "street ported" heads and Stage 2 PI NA cams, 75mm Accufab throttle body, C&L upper intake plenum, Kooks 1.75" primary/3" collector headers, 2.5" full exhaust with mid mount Magnaflow dual in/out muffler, 24lb/hr injectors, 80mm MAF, Tuning from Don @ www.lasotaracing.com, CAI that feeds from fenderwell. Jmod, 3.73:1 TL in Mark VIII carrier, Mark VIII aluminum LCAs, 93 Mark VIII driveshaft, PBR brakes (soon to be Cobras), 18x9 wheels with 35mm offset, 255/40/ZR18 Tires, Front and Rear strut/shock bracing, GR-2 shocks, Eibach 1.5" springs, 1989 SC front and rear sway bars.
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post #11 of 19 (permalink) Old 03-11-2018, 12:40 PM
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Quote:
Originally Posted by T6Rocket View Post
Trac-lok is Ford's name for a limited slip differential. What you're referring to is traction control, that can be turned off with a button.

You can check if you have Trac-lok by looking for axle code E or XE, or just doing a burnout and see if both wheels spin.

Going from 3.27 to 3.73 is a proven performance mod, but you definitely will want Trac-lok if you don't already have it. Keep in mind, the Ford unit is obsolete, so used is your next best option, then rebuild the clutches. You can search Ebay for M-4204-F288, and maybe find a new old stock unit. But make sure it's for an IRS diff, there's a difference.

Also with 3.73's, expect a major hit in hwy gas mileage, like a solid 2-3 MPG drop.

Al
SuperCoupePerformance still has TL units for the MN-12/FN-10 platform in stock. Only place for them as far as I know.
Or, you can use a non IRS unit if you machine the races or leave out the C clips.

97 Thunderbird LX (The GT Bird)
2003 Explorer WAP block with Modular Head Shop "street ported" heads and Stage 2 PI NA cams, 75mm Accufab throttle body, C&L upper intake plenum, Kooks 1.75" primary/3" collector headers, 2.5" full exhaust with mid mount Magnaflow dual in/out muffler, 24lb/hr injectors, 80mm MAF, Tuning from Don @ www.lasotaracing.com, CAI that feeds from fenderwell. Jmod, 3.73:1 TL in Mark VIII carrier, Mark VIII aluminum LCAs, 93 Mark VIII driveshaft, PBR brakes (soon to be Cobras), 18x9 wheels with 35mm offset, 255/40/ZR18 Tires, Front and Rear strut/shock bracing, GR-2 shocks, Eibach 1.5" springs, 1989 SC front and rear sway bars.
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post #12 of 19 (permalink) Old 03-11-2018, 12:55 PM
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In 97s the traction control button is under the center console lid, next to the trunk release button - same spot as the fuel door release in 94-95. 94-96 placed it on the left side of the lower DIN VMM panel, and without it you either had a blank VMM with "indicator lights/fluid levels" text occupying the area, or just a plain storage cubby.
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post #13 of 19 (permalink) Old 03-12-2018, 09:43 AM Thread Starter
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I think if I had a V6 car I would do a 4.10 open diff. Whats 140$ for a set of gears, you would turn that slug into something, I am at a loss for how to describe it. I may even go 4.30s. I doubt I will ever own a v6 car, but never say never

I am going to sell that iron housing as I have an aluminum housing with some 3.55s I am going to install into my car now.

1995 Ford Thunderbird 4.6 LX - SC wheels, enlarged rear sway bar, full sound system, cut mufflers, PST 1 1/8" rear bar, Eibachs, Mark 8 LCA's, Al housed 3.55 gearset, cut mufflers
2011 BMX X5 Xdrive50i - BMS Stage 1, Cut Muffler
2005 Jeep Grand Cherokee 5.7L-Her stock DD
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post #14 of 19 (permalink) Old 03-12-2018, 09:59 AM
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SuperCoupePerformance still has TL units for the MN-12/FN-10 platform in stock. Only place for them as far as I know.
Or, you can use a non IRS unit if you machine the races or leave out the C clips.
Yes, but they are not Ford units, they are aftermarket, Yukon or something. Which means you will have to set all the backlash and gear patterns for just adding the limited slip (not calling it a Trac-lok because it isn't).

With a genuine Ford unit, as long as you keep the shims exactly the way they came out, you just replace one diff with the other if you're only swapping in a Trac-lok. This is the way RobertP does it.

If you're changing the gears, then yes, you will have to set the backlash, etc no matter what, so might as well get the Pukon.

Al
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97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
Previous Fords:
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles
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post #15 of 19 (permalink) Old 03-12-2018, 12:54 PM
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Quote:
Originally Posted by T6Rocket View Post
Yes, but they are not Ford units, they are aftermarket, Yukon or something. Which means you will have to set all the backlash and gear patterns for just adding the limited slip (not calling it a Trac-lok because it isn't).

With a genuine Ford unit, as long as you keep the shims exactly the way they came out, you just replace one diff with the other if you're only swapping in a Trac-lok. This is the way RobertP does it.

If you're changing the gears, then yes, you will have to set the backlash, etc no matter what, so might as well get the Pukon.

Al
Actually, with all the Ford gears I have done, if I was using Ford gears, and a Ford diff, I have never had to change anything with the shims. I always check it when I do a set of gears, and even when I just swap to a trac-lok with the same gears, with the Ford 8.8s at least, I've probably set up close to 100 of them over the years, and I have never had one where I had to change anything from the factory setup. Only twice did I have to do all that, once was with a set of Yukon Gear 4.10s (although their 3.73s also fell right into place like the Ford gears), and once was when someone had previously messed with it and set it up wrong. The Chevy 10 bolt is similar, although the tolerances on that don't seem to be as tight, since a couple times I have had to change up some of the shims.

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post #16 of 19 (permalink) Old 03-20-2018, 10:01 AM
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My v6 5sp car has a 2L73 from the donor SC the trans came from. It's really not too bad with the extra power from the 4.2 and it's great on road trips. I just grabbed a 3L27 from a 96 Sport for it this past weekend though. I'll have to watch a youtube video on how to change the clutches because I just flushed and installed new axle seals on the one in the car.

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post #17 of 19 (permalink) Old 03-20-2018, 10:46 AM
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If it's an SC trans, they are geared very low. That is the only trans that works with the 2.73's, performance wise.

Al

97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
Previous Fords:
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles
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post #18 of 19 (permalink) Old 03-28-2019, 06:13 PM
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Sounds like a "one in a million" find good for you. Don't forget to swap out the Speedo gear in the trans.

Philippe Mentor
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post #19 of 19 (permalink) Old Today, 09:34 AM Thread Starter
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Sounds like a "one in a million" find good for you. Don't forget to swap out the Speedo gear in the trans.
Speedo smedo. I have the 3.55s under the car now. Someone ate the back end of it and damaged the quarter, the trunk and the rear bumper about a month after I went through the ENTIRE suspension. I think it will be ok, my buddy who is a buddy man will have the car on loan to drive in since he blew another motor in his GTO. (6.0 LS newer body GTO). So he will get bored and pull it out for sure. When he was driving the car home after he picked it up he called me to tell me that it was too nice of a car not to fix. He isn't wrong.

1995 Ford Thunderbird 4.6 LX - SC wheels, enlarged rear sway bar, full sound system, cut mufflers, PST 1 1/8" rear bar, Eibachs, Mark 8 LCA's, Al housed 3.55 gearset, cut mufflers
2011 BMX X5 Xdrive50i - BMS Stage 1, Cut Muffler
2005 Jeep Grand Cherokee 5.7L-Her stock DD
1984 Ford F250 6.9 IDIT - head studs in progress
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