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 ??