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Thread: Better Locking Differential

  1. #1
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    Better Locking Differential

    I run several Auto Cross events each year. I'm looking for a better locking differential. Even with new carbon fiber clutches, I'm still spinning the unloaded rear wheel.

    I see the Eaton TrueTrac, Auburn and Yukon differentials. Does anyone have any experience with either of these. Is the Detroit Locker noisy? Any other options?

  2. #2
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    I've had the Detroit Truetrac for 7+ years and never know it's there, works perfectly for Drag Racing.
    1/4 Mile Time 11.542 @ 121.19 MPH
    195,000 Miles & 275+ Runs Down the 1,320
    541.57 RWHP & 476.64 RWTQ on DynoJet
    Tuned by Aric at Injected Engineering
    Vortech Super Charger V-2 T Trim, 19 PSI
    8 Rib Belt, Innovators West 10% Overdrive Dampner
    Air to Air Intercooler, Mini-race Bypass
    Ford Cobra Remanufactured Long Block
    Snow Performance Water-Methanol Injection
    Kooks Headers & X Pipe
    GT MAF, 60lb injectors, Dash 8, Aero Rails, Twin Ford GT Pumps,
    Kinsler Fuel Filter, Kenne Bell Boost-A-Pump
    Monroe Sensatrac, Metco Control Arms, Addco Rear Sway Bar
    31 Ford Spline Axles & Detroit Truetrac, 4:10 Ford Racing Gears
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  3. #3
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    Do you think the Detroit Locker would work ok when cornering under mid to full throttle when running an auto cross?

  4. #4
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    Probably, but I don't know for sure. Try contacting Eaton.
    1/4 Mile Time 11.542 @ 121.19 MPH
    195,000 Miles & 275+ Runs Down the 1,320
    541.57 RWHP & 476.64 RWTQ on DynoJet
    Tuned by Aric at Injected Engineering
    Vortech Super Charger V-2 T Trim, 19 PSI
    8 Rib Belt, Innovators West 10% Overdrive Dampner
    Air to Air Intercooler, Mini-race Bypass
    Ford Cobra Remanufactured Long Block
    Snow Performance Water-Methanol Injection
    Kooks Headers & X Pipe
    GT MAF, 60lb injectors, Dash 8, Aero Rails, Twin Ford GT Pumps,
    Kinsler Fuel Filter, Kenne Bell Boost-A-Pump
    Monroe Sensatrac, Metco Control Arms, Addco Rear Sway Bar
    31 Ford Spline Axles & Detroit Truetrac, 4:10 Ford Racing Gears
    Dynotech MMC Driveshaft
    A-1 Performance Trans, Forced Tailshaft Lube, Carbon Clutches
    3,500 RPM Stall Precision Industries Torque Converter
    B&M Deep Finned Trans Pan
    AeroForce Scan Gauges , Auto Meter Oil, Fuel & Boost Gauges
    Kenny Brown Dead Pedal, 35% Tint, Silver Star Head Lights
    AutoPage Alarm RS-727LCD, Boston Acoustic NX87

  5. #5
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    I don't think a locker would be good. they unlock on turns when you let off the throttle and re-engage when you accelerate and it can be harsh.
    You "feel" the difference because you want to "feel" the difference. Since you just spent money on the upgrade you "have" to feel the difference

    I'm looking to eliminate the double pump process I have to follow right now to get the pedal hard

    2004 300A Procharger #0010 D1SC
    2003 300A Procharger #0017 D1SC (SOLD)

  6. #6
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    How about a spool? Might make daily driving a little challenging when making tight corners.

  7. #7
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    Quote Originally Posted by crouse View Post
    How about a spool? Might make daily driving a little challenging when making tight corners.
    I wouldn't unless you always drive in a straight line.
    When you cant make them see the light, make them feel the heat.
    Ronald Regan

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    is to kill them, keep on killing them, until you kill the last one, then you kill his pet goat."

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    Be polite, be professional, but have a plan to kill everybody you meet.
    "I come in peace. I didn't bring artillery. But I'm pleading with you, with tears in my eyes, if you **** with me, I'll kill you all"
    General James Mattis




  8. #8
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    Detroit TrueTrac/Torsen differentials are the way to go.
    They come standard in Shelby GT350 and GT500s and are part of the Mustang GT performance/track pack option.


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    SOLD : 2003 Mercury Marauder FI. 4 speed Auto
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    'Real Gauges' + matching Trans Temp, Oil Temp, Water Temp, Fuel Pressure, Vacuum/Boost Gauge
    Built: 10/15/02 Bought: 12/16/02 Sold: 10/15/18

  9. #9
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    Quote Originally Posted by Joe Walsh View Post
    Detroit TrueTrac/Torsen differentials are the way to go.
    They come standard in Shelby GT350 and GT500s and are part of the Mustang GT performance/track pack option.
    Is this the model you were referring to?

    https://www.summitracing.com/parts/dtl-912a562

  10. #10
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    The LAST thing Id want on an auto cross track is a locker! Id even prefer an open rear end of it!

    My 4x4 F150 has an open rear end and I wouldnt want anything else on turns. I live in the suburbs so there is a lot of turns/curves. When Im in the Marauder I literally cant give it much gas even on dry cold pavement but I can hammer the truck and only need to worry about the weight of the vehicle spinning me out.


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    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

  11. #11
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    Just don't get that truck on an ice cube size piece of snow w/ an open diff. Hope it's easy to put in 4x4.

  12. #12
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    Quote Originally Posted by Mr. Man View Post
    Just don't get that truck on an ice cube size piece of snow w/ an open diff. Hope it's easy to put in 4x4.
    Ive only got it stuck once. Of course the tires were half bald, old, and hard, plus I was pushing show with my bumper trying to get access to my car trailer in my Moms backyard (about an acre). I made it 3/4 of the way in though! Actually it only happened because I had to lose my momentum and turn around to back up to the trailer. A little shoveling freed her up, grabbed the trailer and planted the go pedal. Made it out just fine.

    Im just glad it wasnt much farther in because the drifts just got deeper! At first I couldnt even make out what snow mound my trailer was under plus the snow was several inches up the door skin when I tried to get out.

    But six or so Chicago winters now and thats been all. Last year with the new 33s I think I only used 4 wheel once? The front end definitely is a limited slip of some sort and thats been just perfect. Way safer IMO than all my old LSD trucks. Thought Id hate it at first and planned to change it, Im just glad I procrastinated!


    Sent from my iPhone using Tapatalk Pro


    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

  13. #13
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    I have driven my daily driver Marauder many thousands of mile with 4.11 gears and a Detroit Locker rear differential.

    I probably should have installed a Trutrac, as Eaton recommended when I talked to them, but already had the "Locker" installed.
    The Trutrac would be better for the street, but I wanted the "stronger" D Locker.

    It is no problem on the street or in snow, but does have inherent backlash, which is noisy, especially when backing up.
    1957 Custom 2 dr Sedan, 1979 F-series 14' U-Haul 330 XD, 1979 F150 4X4 428 PI/CJ heads/NP 435/4:11 axles-rear Det. Lkr., 1993 Grand Marquis, Y2K CVPI supercharged 5.4, 2003 MM

    The more I learn, the more I find out I don't know.

    Confusion will be my epitaph...

    Home of the Berserker Marauder, one of the ancient Norse warriors legendary for working themselves into a frenzy before a battle and fighting with reckless savagery and insane fury, held to be invulnerable...shirtless regardless of wounds...(possibly due to ingestion of psychotropic and hallucinatory drugs such as Fly Agaric Mushrooms)...

    ΓρεεκΓοδ

  14. #14
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    I have a Trutrac in mine. I don't notice it much. But sure is nice when I want it.

    Yukon clutch style is garbage. I literally blew it into pieces a month out of warranty and was told tough luck.
    Last edited by cheapthrillb2; 10-30-2020 at 06:47 AM.
    2003 budget built marauder-LM7 5.3 SBE 4L80E VS racing 78/75 turbo and other things
    1.56 60' 6.80 1/8 @ 104 mph 10.5 1/4 @129 mph
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  15. #15
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    I’ve had a Cobra carbon clutches in my car for 10 years withno issues, remember when rebuilding them there is two thickness shims that gointo the side gears .0025 or .0045, for a tighter clutch set up use the thickerone!

    CHRISRISTOVSKI

    • 82 GT coyote swap started
    • 03 300a Marauder, stroked,cammed,T/S Trilogy Supercharged # 216,Best Et 10.77@129.72 on slicks, 93 pump gas. driven to the track.
    • 2011 GT 500, 3.4 whipple,93 pump gas,10.47@133,Driven to the track.
    • 2003 azura blue Mach 1, cobra motor,2.9 Whipple,crusher inlet,built 4r70w trans,04 IRS rear.full weight street car, Corn Fed

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