tranny ?

[danhammond]

I have a 2002 blazer 4x4 and I hear a hum or whistle after driving for a bit. The fluid is good and it shifts fine. after it starts it keeps going until the truck is off for awhile. It does it in park and while driving, any ideas? I bought it about 4 months ago and it has 145k miles. Thanks

[00Silverado4x4]

I'd start with trying to isolate where the sound is coming from. Without a sound clip it will be difficult to assist you more.