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Thread: A4L60E Transmission Hiss, Squish, noise ??

  1. #1
    Tuner in Training DJ909's Avatar
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    A4L60E Transmission Hiss, Squish, noise ??

    Hi, has anyone heard a noise that sounds a little bit like a blow off valve (turbo) Squish or Hiss or Squelch noise. It never happens during normal driving, and I cant recall it ever happening at WOT shifts, it only seems to happen at elevated revs, say 4000, say I give it some gas in second gear to pass some traffic etc and then back off the gas before the next shift happens automatically, so it shifts at that instant that I back off , it shifts properly and firmly but often makes quite a loud SQUISH or SQUELCH noise . Its a built up A4L60E transmission, behind a mildly modified 6.0 in a conversion car.
    Any Ideas ??
    2005 VZ Monaro 5.7, Harrop HH112, water injection, LT Headers, Flowmaster mufflers, 3.73 truetrac Harrop rear.

    2007 Holden Rodeo 6.0 litre conversion with 4L65E transmission.

  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    For some reason a belt or tensioner noise comes to my mind.

    Otherwise I have no clue.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.