true trac writeup - Page 2

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  1. #11
    CelicaSupra.com Member williamb82's Avatar
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    it will work fine. i used it when i first put it together. i have som amsoil full synthetic extreame duty gear lube to put in it now. ill prolly change it before finishing the hg and also have some amsoil 80w-90 full synthetic to put in the trans.
    william
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  3. #12
    CelicaSupra.com Member Dave A.'s Avatar
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    Re: true trac writeup

    Quote Originally Posted by williamb82
    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. 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


    pics

    Nice write-up, William! Writing up a procedure for something precision like this can be kind of mind boggling and time consuming.

  4. #13
    CelicaSupra.com Member
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    Are the carrier bearings (90368-50006 carrier bearing (2 required))
    for the true-trac larger than the stock MKII diffs ?

    If so I assume these are the part numbers for the larger bearings and races ?

    I am about to start buying the parts to turn my 4.30 stock LSD into a 3.73 true-trac LSD.

    Scott
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  6. #14
    Boosting Mod SilverMk2's Avatar
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    Either the stock diff or the True trac has 45mm or 50mm ID bearings. IIRC the true trac is 45mm. That's why you need those bearings. Everything else are stock parts.
    1985 Super Silver Supra 2JZGTE
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  7. #15
    CelicaSupra.com Member williamb82's Avatar
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    the od of the races are the same as stock. the id of the bearings fit the true trac. and as i recall the true trac uses the 50mm id bearings where as the stock mkii carrier used the 45mm.
    william
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  8. #16
    CelicaSupra.com Member
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    when I was looking for the true-trac it seems you can get the 4 banger version that has the smaller I.E. stock supra bearings size or you can get the 6 cylinder version with the larger I.D bearings.

    Both LSD's are the same price so I might as well go with the larger bearing 6 cyl version.

    The 4cyl part number is TT 911A445, found it here:

    http://www.ringpinion.com/content/pr...id=3&aid=&rid=

    Scott
    1985 7MGTE Supra - R154 swap / 3.73 true-trac / Upgraded PP.
    Full 3" exhaust / magnaflow cat and muffler
    2JZ FF intake manifold / 7MGTE Throttle Body
    24x12x3 FMIC / DSM BOV /AFPR /Lexus AFM
    T04B turbo - H3 compressor wheel, "P" trim exhaust wheel with .58 A/R / Stock manifold with a homemade T4 adapter.
    Tial 38mm Wastegate / 385 rwhp/387 tq @ 16 psi

  9. #17
    CelicaSupra.com Member williamb82's Avatar
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    looks to be a new application it should work as well. however the bearings are the same price for both apps.
    william
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  10. #18
    CelicaSupra.com Member bbaacchhyy's Avatar
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    Just got prices from the local Aussie Toyrota dealer as follows (prices are in Aussie bucks...)

    toyota part numbers
    90366-35023-77 inner pinion bearing $124.63
    90368-50006 carrier bearing (2 required) $77.62
    90311-38010 pinion seal $35.97
    90311-38011 side seals(2 required) $27.48
    41182-22011 cover gasket $15.52
    41231-22010 crush sleeve $25.21
    90179-18001 pinion nut $8.95

    Willaim, how does that compare with the priices that you paid ? I will try and get better prices, but it all adds up to about USD $315 :shock:

    Might have to get you to do a group buy !!!!!

    Cheers

    Michael Bachmann

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  11. #19
    Boosting Mod SilverMk2's Avatar
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    Damn I think I only paid about 150 for all those parts. I'd try and contact Jeff Watson and see if he could mail it to Aus. Not sure what his email is but the phone is 1-800-327-2087, or you could look up the number for Champion Toyota. HTH
    1985 Super Silver Supra 2JZGTE
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  12. #20
    CelicaSupra.com Member williamb82's Avatar
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    yeah, i paid ~$150 usd for all the stuff i listed. i didnt buy the outer pinion bearing though. it looked fine otherwise i would have had to order a new one of those as well. jeff watson should be able to ship to aus. i recall someone buying stuff from him and it being shipped overseas before.
    william
    william
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