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nearly new Ford trac lok not working on ice?

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    nearly new Ford trac lok not working on ice?

    I recently upgraded with rear axle with 9" housing ends, Moser 31 spline axles and a Ford Performance (stock) 31 spline trac lok.

    I take it drag racing a decent amount and spectators tell me it takes a second or two to get both tires spinning in the water box. No big deal.

    I was up in the mountains today and got one tire on ice/snow and one tire on pavement...not on purpose. All it would do is spin the one tire on ice? Had to get pushed out of the way. Seems ridiculous to me, it's less than a year old and it hasn't really been right since day 1.

    Did I do something wrong? Is there a way to adjust these trac loks? Thanks for any input or help!
    1984 Mercury Colony Park Wagon - gone to the darkside. 5.3 LS Turbo Swap with 4L80E. 6.62@106 in the 1/8 mile (low 10's in the 1/4), full weight, AC, no compromises! Rocky Mountain Race Week 2020 and Race Week 2.0 2020

    #2
    If it's a clutch-type rear end, then that's pretty normal if one tire has excellent traction, and the other has zero, provided the vehicle is moving forward. With negligible traction on one wheel, there's often not enough force to fully engage the clutches and "lock" the axles together. If the vehicle has one wheel spinning, yet it's not moving, that would indicate a malfunction. That's why some people prefer true locking differentials. With a clutch pack or cone style, it's not really locked up. You say it was a new unit? I don't know why it would be malfunctioning, unless you cooked the clutches at the track...
    Last edited by Quincy; 02-08-2021, 01:30 AM.
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      #3
      Yep, it's a clutch type. No, it wasn't moving at all. Shoot. Wish there was a way to tighten it up. Hate to have to go out and buy another LSD or Locker...
      1984 Mercury Colony Park Wagon - gone to the darkside. 5.3 LS Turbo Swap with 4L80E. 6.62@106 in the 1/8 mile (low 10's in the 1/4), full weight, AC, no compromises! Rocky Mountain Race Week 2020 and Race Week 2.0 2020

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        #4
        Dropping acid probably won't help, but it will put things in a different perspective....
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          #5
          I'm not an expert at Ford units, but I don't think new clutches is a huge job. Do some googling, there are probably some tricks for tightening it up while you're in there.
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            #6
            You can upgrade to the carbon clutches also you can remove a couple of the steel plates & add 2 extra clutches to the unit.

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              #7
              Originally posted by Mustang Eddie View Post
              You can upgrade to the carbon clutches also you can remove a couple of the steel plates & add 2 extra clutches to the unit.
              Got it...thx! Can this be done without removing the carrier? Just swapping clutches and steels in situ or do I have to pull the unit?
              1984 Mercury Colony Park Wagon - gone to the darkside. 5.3 LS Turbo Swap with 4L80E. 6.62@106 in the 1/8 mile (low 10's in the 1/4), full weight, AC, no compromises! Rocky Mountain Race Week 2020 and Race Week 2.0 2020

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                #8
                Originally posted by drhill View Post
                Got it...thx! Can this be done without removing the carrier? Just swapping clutches and steels in situ or do I have to pull the unit?
                I've never done it that way much easier to do on the bench with no ring gear on it but I guess it's possible.

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                  #9
                  F150 LSD spring also helps. It's quite a bit stronger. Theory about the one in my car is that it's got the F150 spring in it but it's also an 8-clutch setup. It grabs any time I give it anything over off-idle. But being stock engine with no real power stuffs it won't spin the tires in the dry at all unless I'm going around a corner and then it just chirps one tire as it skips on the road. Some would say that's a little too tight, but I don't mind it.

                  Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
                  rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
                  Originally posted by gadget73
                  ... and it should all work like magic and unicorns and stuff.
                  Originally posted by dmccaig
                  Overhead, some poor bastards are flying in airplanes.

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                    #10
                    I'd inspect it, the s-spring could have fractured and is no longer applying pressure to the clutch packs.

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                      #11
                      Yup nevermind, a 9" LSD is designed completely different. No s-spring to fracture, and I'm not sure if the clutch stacking trick would work for this LSD like an 8.8. There is still springs that apply pressure, but I looks like they are coil springs that are captured in a block that would go where a spring is. Doubt the are broken but I could be insufficient preload. Also are you running a friction modifier in the lube?

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                        #12
                        Fark. I forgot it was a 9 inch too.

                        Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
                        rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
                        Originally posted by gadget73
                        ... and it should all work like magic and unicorns and stuff.
                        Originally posted by dmccaig
                        Overhead, some poor bastards are flying in airplanes.

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                          #13
                          Sounds to me like its not a 9"; its an 8.8 with 9" ends on it. Eliminates the need for c clips, and uses press on axle bearings.

                          Was friction modifier used at fill?

                          Low 10s is pretty sporty for a heavy car with a factory style clutch type diff. Not saying it won't work, but for steady track use I'd recommend an upgrade to a locker if you can swing it.
                          **2012 Ford Mustang Boss 302: 5.0/ 6 spd/ 3.73s, 20K Cruiser
                          **2006 MGM,"Ultimate": 4.6/ 2.73/ Dark Tint, Magnaflows, 19s, 115K Daily Driver
                          **2012 Harley Davidson Wide Glide (FXDWG):103/ Cobra Speedsters/ Cosmetics, 9K Poseur HD Rider
                          **1976 Ford F-150 4WD: 360, 4 spd, 3.50s, factory A/C, 4" lift, Bilsteins, US Indy Mags, 35s Truck Duties

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                            #14
                            Originally posted by P72Ford View Post
                            Sounds to me like its not a 9"; its an 8.8 with 9" ends on it. Eliminates the need for c clips, and uses press on axle bearings.

                            Was friction modifier used at fill?

                            Low 10s is pretty sporty for a heavy car with a factory style clutch type diff. Not saying it won't work, but for steady track use I'd recommend an upgrade to a locker if you can swing it.
                            correct it is the stock 8.8 with 9" housing ends. Yep, friction modifier was used. No chattering and super smooth driving. Maybe too smooth!

                            I'd consider saving up for a better unit vs trying to tighten this one up (carbon clutches, extra clutched F150 spring) but we use it every day and my wife wont like to locker chattering around corners. Maybe a True Trac?
                            Last edited by drhill; 02-08-2021, 04:30 PM.
                            1984 Mercury Colony Park Wagon - gone to the darkside. 5.3 LS Turbo Swap with 4L80E. 6.62@106 in the 1/8 mile (low 10's in the 1/4), full weight, AC, no compromises! Rocky Mountain Race Week 2020 and Race Week 2.0 2020

                            Comment


                              #15
                              Originally posted by drhill View Post
                              correct it is the stock 8.8 with 9" housing ends. Yep, friction modifier was used. No chattering and super smooth driving. Maybe too smooth!

                              I'd consider saving up for a better unit vs trying to tighten this one up (carbon clutches, extra clutched F150 spring) but we use it every day and my wife wont like to locker chattering around corners. Maybe a True Trac?
                              I think the Detroit true trac is decent; nowhere near as clunky as the original DL.

                              I have a 2012 Boss 302 with a factory "torsen" diff (31 spline); not sure if they are available over the counter or or not. I do know it always lays the rubber down (even with 28 13.50 15s Quicktimes) and its operation is seamless; I've never encountered any funny sounds or clunks I'm kind of embarrassed to say I don't know what mechanism it uses, but I know it works good!
                              **2012 Ford Mustang Boss 302: 5.0/ 6 spd/ 3.73s, 20K Cruiser
                              **2006 MGM,"Ultimate": 4.6/ 2.73/ Dark Tint, Magnaflows, 19s, 115K Daily Driver
                              **2012 Harley Davidson Wide Glide (FXDWG):103/ Cobra Speedsters/ Cosmetics, 9K Poseur HD Rider
                              **1976 Ford F-150 4WD: 360, 4 spd, 3.50s, factory A/C, 4" lift, Bilsteins, US Indy Mags, 35s Truck Duties

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