noise from 50-55 mph

[doylee4693]

Does anybody elses tahoes make a slight whistling sound when truck hits 50 mph and goes right away at 55?The noise only happens when foot is on accelerater.Just changed my diff fluid so im hoping its not that.Seems like every car ive ever changed tranny and diff fluids on something always pops up not too long after.

 

[doylee4693]

*bump* anyone?

 

[Rivieraracing]

Is it only in a certain RPM range when at that speed? What gear is it in when it happens?

 

[Red_Raider]

Is it only in a certain RPM range when at that speed? What gear is it in when it happens?

x2

 

[doylee4693]

Is it only in a certain RPM range when at that speed? What gear is it in when it happens?

It happens at any rpm as long as im giving it gas between 50-55 I can hear it.As for the gear its in i'll have to check next time I take the truck out.

 

[Parthery]

It's either the bearings or the gears in the rear end....my 2008 had the same problem.

Good news is, if it's less than 5 yrs or 100K miles old, it's covered under GM's powertrain warranty.

 

[Rivieraracing]

Do you have a cold air intake? Might be a slight air leak around the filter connection or around the throttle body or such!! I've had that happen on mine and it would only whistle at a higher speed while stepping on it!! Can't remember what RPM range or speed it was but it was enough to annoy me and fix it!

 

[doylee4693]

No, no cai and rear diff fluid has been changed once a while ago,the fluid was clean as its only got 71k on it. I noticed this morning the noise was much worse then before. Any more ideas? Has no one ever had this issue, the noise is not good. My mechanic (very very lazy lately) says it in the motor.

 

[JochenWoern]

Does anybody elses tahoes make a slight whistling sound when truck hits 50 mph and goes right away at 55?The noise only happens when foot is on accelerater.Just changed my diff fluid so im hoping its not that.Seems like every car ive ever changed tranny and diff fluids on something always pops up not too long after.

Do you have an aftermarket tip on your exhaust?

I had the issue once when I put a dual chrome tip on the single pipe. Could not figure out what the issue was until I went to the dealer, I floored the truck in their parking lot and the service adsvisor did hear the sound come from the exhaust pipe. Once hitting the accelerator hard, there was so much exhaust pressure going through this dual tip that it started to whistle. Changed the tip to a single one and the problem was gone.

 

[doylee4693]

Do you have an aftermarket tip on your exhaust?

I had the issue once when I put a dual chrome tip on the single pipe. Could not figure out what the issue was until I went to the dealer, I floored the truck in their parking lot and the service adsvisor did hear the sound come from the exhaust pipe. Once hitting the accelerator hard, there was so much exhaust pressure going through this dual tip that it started to whistle. Changed the tip to a single one and the problem was gone.

No its got the stock exhaust on it. It starts at exactly 50 mph and goes completly silent at 55 lol