true trac writeup

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  1. #1
    CelicaSupra.com Member williamb82's Avatar
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    true trac writeup

    ill edit this with the rest of the specs when i get a chance to look them up.

    true trac part number
    911A342

    toyota part numbers
    90366-35023-77 inner pinion bearing
    90368-50006 carrier bearing (2 required)
    90311-38010 pinion seal
    90311-38011 side seals(2 required)
    41182-22011 cover gasket
    41231-22010 crush sleav
    90179-18001 pinion nut




    first off, you need to make sure you have all the parts neccesary to do the conersion. second, make sure you have a diff with a good ring and pinion. you will need a large bench vise to make this easier.

    first drain the fluid from the diff. then clamp the nose of the diff in the bench vise, and remove the nut that is on the nose of the diff. youll have to use a small punch or screw driver and a hammer to bend the notch out so it will unthread.

    once thats out, slide a long punch betwen the diff case and the side output shaft. then smack the punch with a hammer to pop the output shaft out of the diff. repeat for both sides.

    then remove the 8 bolts holding the cover in place and remove the cover. then remove the 4 bolts that are holding the center section in place. you'll have to use a long breaker bar or an impact gun. they are tight.

    once they are out, remove the caps but mark them so you will remember what side they go on. also, when pulling the center section out there is a shim on each side. keep these. youll need these and may need an assortment of them to get it adjusted right after assembly.

    now that the carrier is out, remove the pinion bearing. remember how everything went together. there is a bearing that will slide out from the nose as well. now, if replacing the pinion bearing, youll want to use a punch and a hammer from the front of the diff and drive the race for the pinion bearing out.

    now, the diff case needs to be cleaned. you can have it hot tanked at a machine shop, or, do what i did. i put it in a 5 gallon bucket and then poured purple stuff engine degreaser in till it was completely submerged. i let it sit for over an hour then scrubbed it with a stiff bristled brush. there is a black coating on the inside of the diff that will prolly not come off. dont worry about this. after i took it out of the bucket, i then scrubbed it with soap and water to get the degreaser residue off and to prep it for paint. then i put the ring and pinion gears in to let them soak as well. when painting, make sure to block all the holes for the bolts and also make sure no paint will get inside the diff case.








    now, youll need to take the true trac and the carrier bearings to a macine shop to have them pressed onto it. also take the pinion ger with you to have the old bearing pressed off and the new one on if replacing it. make sure the shim is left on the pinion gear when they press the new bearing on. once all that is done your almost ready to assemble.






    dave soaked all the bolts and whatnot in carberautor parts cleaner for several min to remove all the gunk that was on them. now, you will need a brass punch to drive the new pinion bearing race into the diff case. make sure you do this carefully as it must be perfectly straight.



    once it is in, slide the pinion gear in, then put the new pinion seal in and make sure you slide the parts back ont the pinion shaft in the correct order. and make sure you put the new crush sleeve in there and not the old one. also use a new nut.

    once together, you need to very very slowly tq the nut till it takes ~3.5-5.2inch lbs for a used bearing or 10.4-16.5inch/lbs for new bearing to turn the pinion gear. if you tq it too much you must pull the nut back off and get a new crush sleeve so be very carefull. too much preload on the pinion bearing will destroy it very quickly.

    now, you will have to use a small flat head screw driver and a punch to bend the little tabs back that lock the bolts that hold the ring gear to the center section. then use an impact gun to remove these bolts. then you need to use new tabs when bolting the ring gear to the truetrac.the bolts need to be tqed to 71ft/lbs then push the locking tabs up against the nuts as they were before.

    now, insert the true trac in with the races on each bearing and for starters use the shims you had removed before. the shims are used to adjust endplay and the preload on the carrier bearings. the preload should be ~3.5-5.2inch lbs as should the total preload. and the backlash should be 0.0051"-0.0071" once the right endplay and preload is set install the caps and tq them to 58ft/lbs and recheck that the preload and backlash are still within spec.










    use a new diff cover gasket and coat it lightly with ultragray rtv sealant. its best to rub a lil on your fingers and then smear it on the gasket so that there will be no excess to squish out. then install the diff cover and tq the bolts to 16ft/lbs. reinstall the axle stubs, and then fill the diff with the proper amount of fluid and its ready to be installed.





    and here is a very helpful link.

    http://www.cygnusx1.net/supra/librar...ra/RA_018.html

    http://new.photos.yahoo.com/williamb...60762348387882

    here is why i needed the truetrac.







    Last edited by williamb82; 06-06-2013 at 10:15 AM.
    william
    Hidden Content black 84 7mgte, MS2, truetrac, bbk, etc...soon to have 2jzgte and t56
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  3. #2
    CelicaSupra.com Member BoostedTDI's Avatar
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    Good stuff. Question on the ring tabs when bolts onto the truetrac, did you get these at the dealer?
    Ex-84 Supra
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  4. #3
    CelicaSupra.com Member williamb82's Avatar
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    yes, they are a dealer item. i dont have a part number. ill have to look it up.
    william
    william
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  6. #4
    CelicaSupra.com Member ZZT231's Avatar
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    William,

    How much did it cost you to buy all the listed items above for you (if you did)?

    Cheers.

  7. #5
    CelicaSupra.com Member williamb82's Avatar
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    true trac part number
    911A342

    ~325 shipped

    toyota part numbers
    90366-35023-77 inner pinion bearing
    90368-50006 carrier bearing (2 required)
    90311-38010 pinion seal
    90311-38011 side seals(2 required)
    41182-22011 cover gasket
    41231-22010 crush sleav
    90179-18001 pinion nut

    ~$150 total

    then i bought a 3.727 non-lsd diff from the pick and pull for ~$60 with corecharge and tax. then the purple stuff degreaser and paint ~$20 then the money for the machine shop to install the bearings ~$40 then ~$10 for gear lube so a lil over $600 total.
    william
    Hidden Content black 84 7mgte, MS2, truetrac, bbk, etc...soon to have 2jzgte and t56
    Hidden Content blue 85 beater
    Hidden Content black 86 triple weber 6m in the works!

  8. #6
    CelicaSupra.com Member bbaacchhyy's Avatar
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    ZZT231,

    I need to get bearings for mine, and my brother in law works for a mob that has a toyota dealership, so armed with the part numbers (thanks William) I'll see what I can do for prices

    Cheers

    Michael B

  9. #7
    CelicaSupra.com Member ZZT231's Avatar
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    Quote Originally Posted by bbaacchhyy
    ZZT231,

    I need to get bearings for mine, and my brother in law works for a mob that has a toyota dealership, so armed with the part numbers (thanks William) I'll see what I can do for prices

    Cheers

    Michael B
    bbaacchhyy,

    Please do! I will buy a backup set as I already done 8,000kms on the diff and it's back in the shop to get a new set of bearings... Thanks William for those part numbers, it makes life soo easy

    Cheers.

  10. #8
    CelicaSupra.com Member williamb82's Avatar
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    i doubt you had the wrong bearings. if you did they wouldnt have fit, i bet they set the preload too tight. that will kill bearings fast.
    william
    william
    Hidden Content black 84 7mgte, MS2, truetrac, bbk, etc...soon to have 2jzgte and t56
    Hidden Content blue 85 beater
    Hidden Content black 86 triple weber 6m in the works!

  11. #9
    Great work William...making this a sitcky for a while so everyone has a chance to see it.

  12. #10
    CelicaSupra.com Member ZZT231's Avatar
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    What type of Oil do you use for the TruTrac? I was told to use the Standard Diff Oil (85W-90) is that correct? :?

    Cheers.

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