1996 Oldsmobile Ciera Transmission Whirring Noise

Tiny
CASHIVELY
  • MEMBER
  • 1996 OLDSMOBILE CIERA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 167,000 MILES
167K miles on original 4T60E transmission. On cold start (overnite temp less than 50 deg) transmission makes "whirring" noise for about 2 seconds in park. Then makes same noise when engage any gear. Shifts seem normal (no slipping or delay) but makes same noise first few times. After a little driving to warm up, operation is perfect. Fluid level before cold start is up to bend in dip stick. Immediately after start is at lower end of temp range. When hot, is at upper end of temp range. Fluid and filter changed at 60K and 120 K. Problem started over a year ago after I accidentally let vehicle idle for about 15 minutes with vacuum line disconnected from modulator. Lucas transmission additive fixed problem until now. Any suggestions short of complete overhaul? Tx for your advice.
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Monday, October 27th, 2008 AT 7:31 PM

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Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Unfortunatly the only way to tell if something has gone away inside is to visually inspect, shy of pressure test that a trans shop can do. Sounds like it may have somethign in the valve body sticking or hanging up at lower temps. May want to have a trans shop look atit first
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Tuesday, October 28th, 2008 AT 2:16 PM

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