Another 4l60e bites it

Discussion in 'Transmissions' started by Kv5137kv5137, Feb 1, 2019.

  1. RDF1

    RDF1 I'm Awesome

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    Hum... I must have misunderstood the diagram..
    Lemme find my manual and make sure I'm not just completely off my rocker.....


    Sent from my HiDiNg PlAcE
     
  2. UGLYTRUK

    UGLYTRUK Newbie

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    Interesting reading.
     
  3. UGLYTRUK

    UGLYTRUK Newbie

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    I get doses of Sanity from these forums. Thank you
     
  4. David Barry

    David Barry Newbie

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    Not sure if this is of any help.

    Sonnax

    4L60-E, 4L65-E, 4L70-E
    TCC Regulator & Isolator Valve Kit
    Part No. 77754-03K

    Fits '97-earlier Non-EC3 units only
    In GM 4L60-E, 4L65-E and 4L70-E unit, severe wear of the TCC regulator valve bore is caused by oscillation of the OE valve allows regulated converter apply pressure to exhaust. This is a primary cause for TCC-related slip code P1870 and overheated converters. Exhausting apply pressure also diminishes line pressure, which can result in burnt clutches. Excess wear at the isolator valve bore reduces TCC apply pressure.

    Reconditioning the bore and installing Sonnax TCC regulator and isolator valve kit 77754-03K restores normal TCC operation by shoring up the hydraulic integrity of this circuit.

    • 10% Higher apply pressure

    • Isolator valve lengthened to operate in unworn portions of the bore

    • Sleeve manufactured from highly wear-resistant aluminum

    • Hardcoat anodized aluminum valves combat premature wear

    • Annular grooves help center valves in bore to reduce future side-load wear
    Contents

    • Isolator Valve

    • Spring

    • Regulator Valve

    • Regulator Sleeve
    Symptoms:
    • Code 894, 1870

    • Overheated converter

    • Low TCC apply pressure

    • 3-4 Clutch burned

    • 1-2 Harsh

    • Low line pressure
    Cause:
    Excess wear at TCC regulator/isolator valve bore allows TCC apply pressure to exhaust.

    Correction:
    Recover hydraulic control and renew TCC performance by reconditioning the bore and installing Sonnax TCC regulator and isolator valve kit.
     
  5. UGLYTRUK

    UGLYTRUK Newbie

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    An interesting side note, is that Sonnax is located in Bellows Falls Vermont, not exactly the place you'd expect a machine shop style of business to be running, you you'd expect it to be in Ohio or Michigan, former manufacturing hubs of the country. It's also owned by Berkshire Hathaway, which is controlled by one man. One of the wealthiest men in the world, Warren Buffet, he usually sticks with food companies. He also owns GEICO and a lot of Kraft-Heinz (47%), you know the ketchup cheese and soup company? According to Wikipedia, he's also the biggest financial services company in the world. How did he end up with a transmission company? Maybe he had trouble with a transmission and he says "I'll fix that, I'll buy a trans company".
     

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