My car had the same symptoms, got loud at 40, quieted at faster speeds, then got loud again at 60. It turned out to be a problem with the wheel bearings. They replaced the assembly in one of the wheels, $220, and the car sounds normal again.
Having a bad rod bearing could cause a truck to make a loud knocking noise and shake when driving at high speeds. The engine having a coolant leak or an engine timing problem could also cause the knocking noise.
Wheel bearing.
It could be a wheel bearing or the center carrier bearing of the driveshaft.
over 55 mph
Drive the car on the road about 25 mph. Weave the car left and right. If the noise changes then it is the front wheel bearings.
If this noise changes pitch when turning left or right, it's a wheel Bearing that is failing...
I hear a clicking noise coming from my jeep when I hit speeds greater then 50 MPH? any ideas on what can cause this
I posted this earlier. weather the van is in gear or out of gear, driving or braking, as soon as it pass 50 mph it starts to make clunking noises from under the engine. not particular to one particular place but mostly from under the passenger footwell, then under the engine itself and sometimes a quieter noise from under the driver seat area. the noises sound like a chipping of metal or a quick and short grinding noise.
No, in full electric mode which some can do up to 60+ mph, they are almost silent.
Your car is changing into a higher gear.
A humming noise in a 2001 Saturn SL2 when driving over 50 mph could indicate several potential issues. It might be related to worn wheel bearings, which can produce a humming sound as they fail. Another possibility is tire problems, such as uneven wear or unbalanced tires, which can create noise at higher speeds. Lastly, the noise could also stem from issues with the drivetrain or transmission components.
It depends on what engine is in it and who's driving, my 1966 with a stock 289 has gone 130 mph.