true trac writeup - Page 23

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  1. #221
    CelicaSupra.com Member MrBubbles00482's Avatar
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    Quote Originally Posted by williamb82 View Post
    The carrier bearing part numbers listed in this thread are NOT for the stock LSD. They are for the truetrack, which has a larger inner diameter for the carrier bearings.
    .

    Thank you for the clarification William. Since I'm staying stock LSD with a weir kit I'll use the 90368-45002 bearing.
    1985 P-type "Elvira" Blue inside out.
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  3. #222
    CelicaSupra.com Member
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    My delimna is the ring and pinion. I have been through 2 roaring/whining diffs and don't want to waste money on another one. My opinion is that they will last if you drive them on the street but if you take them to the dragstrip they just won't hold 400 hp after 5 to 10 runs. I have followed several posts and most of them are complaints about theirs whining also. My second one came from someone on these forums everyone raves about but it roared the day I put it in and after making a few runs at the dragstrip it started roaring so bad I was embarrassed to drive it through my neighborhood.

    If I do decide to go back with the same thing (which I don't want to do), do we have a Toyota online guy we can buy the parts wholesale from?

  4. #223
    CelicaSupra.com Member Funkycheeze's Avatar
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    My used 3.73s have been super quiet behind 550+ horsepower even after track days etc. It is all in the setup, and I use a 80W140 gear oil due to the extra heat.
    '84 P-type, 5spd, torrid red, black/grey leather
    Built 7MGTE (JE's, ARP studs, MHG), BOSS STG4 60mm, AEM standalone, R154, 2 1/2" IC and 3" turbo back - the works
    Coilovers, ROH wheels, 4 corner BBK, Konis, ADDCO bars, PST bushings etc. etc.

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  6. #224
    CelicaSupra.com Member
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    Good to know.

  7. #225
    CelicaSupra.com Member
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    What were your quarter mile times and mph?

  8. #226
    CelicaSupra.com Member Funkycheeze's Avatar
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    I don't do drag racing much - more roadcourse lapping. Years ago I ran a 12.1xx at around 125 mph. If your replacement ring and pinion that 'roared' right after installation didn't have severe preexisting damage, then the set-up was not correct.
    '84 P-type, 5spd, torrid red, black/grey leather
    Built 7MGTE (JE's, ARP studs, MHG), BOSS STG4 60mm, AEM standalone, R154, 2 1/2" IC and 3" turbo back - the works
    Coilovers, ROH wheels, 4 corner BBK, Konis, ADDCO bars, PST bushings etc. etc.

  9. #227
    CelicaSupra.com Member SupraFiend's Avatar
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    Who set it up? There are a million DIY diff rebuild vids on Youtube, but you can not learn all of the ins and outs just from watching a vid. I do everything myself, except diff setup. I take mine to a buddy who is a Toyota tech and does these at work all day. I've done enough with him to be comfortable doing them on my own now, but when I have one that really needs to hold a lot of power, I'll be going back to him.
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  10. #228
    CelicaSupra.com Member williamb82's Avatar
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    Pinion preload is key to a quiet diff. Get it wrong, and it will howl like crazy! Carrier preload is important too, but most howling is due to the pinion.
    william
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  11. #229
    CelicaSupra.com Member Funkycheeze's Avatar
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    And contact pattern, especially if you are swapping different gears into your housing. I have found to get a good pattern on used gears you often end up with backlash on the high end of the spec, which is fine.

    Pattern on both drive (especially drive) and coast should be as good as you can get it, and pinion preload needs to be accurate (recommend a solid spacer here). Side shim preload should be set so that the second 'washer' shim you install can go in about halfway by hand and tapped in the rest of the way with a brass drift and hammer. Backlash spec is .003 to .007 but I find used gears usually end up in the .005 to .010 range when the pattern is perfect. Any adjustment in backlash affects the pattern as well. Spec for the truck 7.5" diffs is .003 to .010

    3.73s in my Supra ended up at .009 backlash with a perfect pattern both sides and are whisper quiet even with all the poly in my car and minimal sound deadening. Many track miles on that diff too - again I use an 80W140 oil and 'bellows' style sealed diff breather due to all the heat in a diff that only holds around 1 liter of lubricant.
    '84 P-type, 5spd, torrid red, black/grey leather
    Built 7MGTE (JE's, ARP studs, MHG), BOSS STG4 60mm, AEM standalone, R154, 2 1/2" IC and 3" turbo back - the works
    Coilovers, ROH wheels, 4 corner BBK, Konis, ADDCO bars, PST bushings etc. etc.

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